I want to lose weight and can't I have been on a 1250 calories diet for 7 moths lost only 15 lbs. I took phentermine years ago and would like to get a prescription again. I exercise and don't drink pop or booze, I walk about 12 miles a week. I am 58 yrs old, type 2 diabetic, high blood pressure, thru with menopause, and weigh 247lbs. I am tired a lot and all of my blood work comes back normal.