I'm going to take a little different approach than the other responder.
I don't believe that water represents emotions. In fact I believe that many of those "automatic" labels that so many dream books and web sites hang onto astral events are other people's imagination. Some people claim that the layers of our aura are a fixed color when in fact they are changing color all the time. We are each the best interpreter of our astral experiences and we know what they mean. The more we remember them and try to understand them, the more that we do get our answers about them.
It looks to me like you can see the entire waters in the lake clearly, and you were looking for the dangers that the others told you about and you didn't see any. I take that as you wishing expand your spiritual growth and others don't want you too - because they can't let themselves have an expanded awareness and growth. You are currently desiring to go in directions/places you haven't been before whether it is education, job, family, but whatever it is you are looking for new and clear direction.
As a 4 year old child I almost drowned in a muddy and rushing river as I didn't know how to swim and there wasn't any lifeguard at our picnic site. My mother didn't see me as I lost my footing and disappeared underwater and it was a man who I'd never seen before who came into the river and grabbed me under my arms and pulled me to shore. This left me with a fear of water that raises it's head from time to time. I did learn to swim but was never a good swimmer. Yet as I travel on the astral in my astral body (others call it a dream world but it is just as real as the Earth plane) I have no fear of water whatsoever. I often swim underwater where I am able to breathe easily. On the astral I also swim on top of the water many times in fast moving currents, right next to the city I live in. (I live in a city on Puget Sound that has very fast and dangerous rip tides that change elevation as much as 14 feet in 6 hours and even takes the life of one or two SCUBA divers each year.) I simply don't ever remember being in any real fear during these dreams. I also have dreams/astral experiences of flying - just my body, just moving any place I wish and again having no fear.
Bottom line for you is that I think you as spirit are looking to expand your world beyond where you are currently at. You post in the Dreams section a lot and that shows me that you have a spiritual orientation to the world.
Your astral body is attached to your physical body with a silver cord and has all the attributes that you physical body has. You can learn to recognize the chakras and energy system of your physical body and when you do you will discover that your third chakra (power chakra - pit of your stomach) also contains your out of body experiences and memories. You can clean out this chakra - with your hand, with a gold healing energy and both your experiences and memory will "improve."
In the bible verse below the "silver cord" is the cord between the astral body and the physical body and at death it is broken.
Ecclesiastes 12:6 "Remember Him before the silver cord is broken and the golden bowl is crushed, the pitcher by the well is shattered and the wheel at the cistern is crushed...."
"I realize that I had a conflict buried in my subconscious. It had to come out into the light of day. In doing so, I was bipolar. I believe this is a natural course for cleansing.Now that I'm aware of it, I wonder if it's safe to try and open up these channels again. The people in the background, telling me to stay out of the water, are all aspects of myself and the fears I've adopted through this process."
I'm not being sarcastic by any means but I believe that all of us have conflicts buried in our subconscious and what so many call "the subconscious" is in fact the eternal spirit that resides within each of us.
I think that you would enjoy this site of one Jane Alexander (http://voices-of-recovery-schizophrenia.blogspot.com/2008/07/jane-alexander-m...) who was incarcerated for more than two years as a teenager for being bipolar and schizophrenic. She has multiple web sites besides that one that I listed and I don't know how current she has posted because she threatened to stop posting about a year or so ago. But, Jane was put on all sorts of meds and then about age 23 she stopped all of her meds and turned to meditation for 10 and 12 hours a day - went from one kind to another and after about five years was completely cured of her bipolar condition. Her story is really inspirational and not only that, just plain miraculous. She was badly abused as a child and I think that is behind many of our difficulties as adults but while growing up we rationalize it all by telling ourselves that our family situation is normal. I have a book on my shelf by a psychiatrist who says that "93% of all children were abused while growing up." I think he missed it by 7%!
I have practiced a from of meditation (in a regular sitting position, feet flat on the floor) for more than 30 years and it has taken me through both hell (PTSD - two divorces, death of a son) and high water, and finally to a point where I really enjoy life. I'm an old fart so I have time and I spend a minimum of an hour a day in private meditation, turning within, and practicing grounding (a connection between my first chakra and the center of the Planet). It isn't a "serious" time, it is just learning to find me and who I am and it is a never ending process. And yes I often have to laugh at some of the life choices I've made - particularly in relationships, because it hurts too much to cry.
During my PTSD experience where I had horrible nightmares for days on end, I sought counseling. I didn't find it all that great and I think that when psychiatrists put labels on people they are simply looking in the mirror and not the person they are counseling.
Where you take your spiritual journey is your choice but I certainly wish you the best.