Looking for help, motivation, and ideas

Shakespearenut

I've been eating right and getting back to exercising after two years of being almost back to my old weight (I weighed 300 before in 2007/2008 and was down to 200/190 in 2010). Currently I'm sitting at 245/250. I just can't seem to lose the weight. I've been eating better and working out once a week and then I got sick with the flu, then bronchitis. So my good friend told me to try this shake/cleansing diet and said that it's a sure thing and i'll be okay. I was allergic to it and went into anaphylaxis. So needless to say, I took a break from exercising for a while. Then I got told that it made me lose a few pounds but now I've gained it back.
What I'm saying is, is the sheer and simple fact that I can't believe that I let myself get back to this size/weight.
I want to be better.
I want to be thinner.
I want to be me again... not two of me.