feeling down

I've always struggled with my weight (no matter how thin I was I always felt fat) I'm 12 weeks pp and struggling so bad because I need to lose weight but am breastfeeding my baby and honestly I have no clue how to lose weight in a "healthy" way. If i exercise it's to extremes same with dieting partly because I am used taking prescription diet pills. Yesterday I watched my husband check out a girl running by and when I called him out on it he laughed and told me to relax. I don't think he has a clue how bad I'm really struggling not to go to extremes cause I want to continue to bf my baby, but watching my husband watch another girl makes me feel so unattractive and unwanted. I just don't know what to do