I have been on Phentermine for almost 3 months. I had lost 22 pounds, which I was happy about but now the Phentermine seems to have stopped working. My appetite has come back (with a vengeance!) and all I want to do is eat all the time. Help!! I'm taking the pills as always but since about Feb 6, they just don't seem to work. and I've gained back 5 lbs.