I'm so sorry you are dealing with these kind of symptoms when you should be pretty carefree at this time. Any age is bad of course, but ..you know what I mean. I'm dealing with a different issue, but I have done a lot of research and have run across some of your symptoms that you wouldn't normally associate with the cause, and I'm definitely NOT saying this is what you have going on.
First off, I would say to find a good naturopath...if you are anywhere near Kansas or Missouri in the states, I can help you with that. They use a diagnostic tool that will point to the root problem, and what to do about it. See http://www.ehow.com/info_8642754_computers-used-naturopathic-diagnosis.html.
My naturopath got trained after dealing with his own health crisis, so he's been there http://www.spiritofhealthkc.com/

Now to what I found in my research ...parasites can cause all kinds of joint trouble (I'm personally dealing with this) They can get into a joint and encapsulate themselves there causing edema (swelling) severe pain and that affects joint mobility. Pain may move from one joint to another..it may not stay the same every day. They can also cause skin pigment changes due to the toxins they put off.
Numbness and tingling are also caused by these major pests ..I have hands that go numb off and on and one night it was the sole of my left foot due to the parasite in my left knee. For a week I had issues with left leg pain until at it's end it had whole leg involvement ...
I also have a ganglion cyst in my right wrist at the moment ..am not sure what causes these, but the last one I had I took care of the old fashioned way and slammed a book on it..(hurts but it's effective lol)
These pests can clog your lymphatic system and cause a build up of the bodies toxins causing brain fog, adhd like symptoms, memory loss, fatigue, anxiety, insomnia, headaches, visual changes, mood disorders, and edema in extremeties.
Again, let me say..I'm not saying this is what you are dealing with...but if any of this fits you, it's a place to start.
I would at the least, just because EVERYONE should ...do a g.I. and liver flush or cleanse.
I hope this helps you in some way...contact me if you'd like further info or links on some what I've told you...and don't ever give up looking for answers or advocating for yourself!