my head is about to 'splode!

I have decided to quit the weight loss pills. I was on phentermine. oh it works trust me but 1. you can not poop 2. you have dry mouth all the time.

so I have decided to do this the old fashioned way by working out and watching what I eat. I have been doing this for two months and I feel great but I have gained 7 pounds. I feel like drowning in a tub of tears.
I eat no processed foods and workout 2 hours every day. How the fuck is it even remotely possible that I gained weight?
I am following the p90x diet and exercise plan. I am so frustrated, I am afraid of being one of those people that have to cut out of their house.