Four years ago I lost 80 lbs using phentermine diet pills. I stopped because I had started a third shift job and found that the hours made it hard to keep up my diet. I still had a month of the pills left and recently decided to finish them since I'm now on an earlier shift. Since taking them again for a couple of days I have developed a strange breathing issues where it's hard to take a deep breath. I think this may be an anxiety issue since these pills really heighten my stress level. I had this problem before but I don't remember it being this persistent. I know I'm going to have to stop because it's too scary and bothersome. Has anyone else had this issue?