Starting a water fast, totally new to the whole thing Day 1 of ? Need some suggestions.

Hi everyone! Have been reading a lot of the messages on this board for the past few hours and have gotten very inspired. In short I just finished my finals, and have basically been a total nervous wreck for the past few months, I got very sick and lost a lot of weight went from a 115lbs to a 102 (I'm 5'9 so it wasn't a pretty sight) after I started getting better I was getting so much pressure from all my family and my dr's to gain weight that I started eating what ever I got my hands on just to make people leave me alone. Well I gained the weight and then some, this has never happened to me before but I just kept on eating, I would eat until I felt ill and to be quite honest I feel like a lot of the time's I actually ate to make my self feel ill, why I don't know. Anyways now I have reached an all time weight peak weighting in at a 134lbs, I realize that this isn't that much but for a person that has been around 110-115 her whole life its a whole lot and I sure don't feel comfortable. The extra 15lbs are making me feel so crappy but even worse is the feeling that I gained the weight by putting all this crap into my body I don't even want to think about all the toxins. (Not to mention the toxic crap that those 6 weeks of Antibiotics consisted of and for the record I don't think I have ever felt so horrible I hate that medicine)

I have been reading about fast for the past few years and have always wanted to do one, for some reason the timing has always been way off, I have been traveling like crazy, taking finals, working and so on but now it seems that the opportunity has presented it self. I just finished finals, I have 9 days until next semester starts and no particular plans. I do have a lot of things I need to get done, but non that need intense mental or physical strengths. Still I have to admit that I am very very nervous. When I started planning my fast yesterday I first had in mind a 3-6 day water fast, as I kept reading more and more my mind shifted to 10-16 and now 12 hours later I REALLY REALLY REALLY want to do 16 days, I have so many toxins in my body that I think the 16 days would really help me to get rid of the Antibiotics , the painkillers, and the endless sinus infections that I keep getting, plus I might get some of my energy and stamina back. Plus of course hopefully I'll get down to my normal 110-115lbs.

My biggest fear is that I simply won't be able to do this, from what I can tell the first 3 days are the most difficult, if that turns out to be the case I'm fairly certain that I can keep going and that the last 13 day's will be a enjoyable challenge but if the 4th and the 5th are just as hard I'm afraid I will give in.
Anyways, I am going to try and take it one day at a time, come here for some advice and inspiration, go meditate and pray every day, and maybe go to Pilates if I have the strength. I usually run every day and I really enjoy it, but I'm not sure if running while fasting is a good idea, have been reading some very mixed advice online about running while fasting, I would love your input if you have any thoughts. Other than that I think my best chance of success is to stay focused on the benefits, keep busy, smile, love and laugh.

If you have any advice it would be greatly appreciated,
Lots of love, Ravi

P.s. Last time I ate was 13 hours ago and I'm not going to lie I'm a bit hungry, at first this made me a bit nervous, already hungry omg, but then I figured that the sooner this fast gets to be very hard the sooner the hard part will be over. So I am embracing the hunger!

P.s 2 so sorry how long this became.