I used to weigh 100lbs and I am 5'4. I have wieghed that weight since I was 20yrs old. I recently gained 17 lbs in 3 months. When I started gaining the weight and I gained 15lbs, I cut my calorie intake from 1200 to 600 and exercising everyday for 45 min. I never used to exercise at all. I am confused andn upset. I continue to gain weight. On top of this, I have not been able to really go to the bathroom(bm) during ths time. Help!