hi ive had anorexia on and off for a couple years now and always had my period even at my lowest weight (bmi 13.6-14) I'm at a higher bmi now but still underweight. Since about 10 days ago I've been heavily restricting, I've fasted 3 days and had 190-360 calories the other days and one 596 day. I haven't pooped at all these 10 days and after the first 3 days of restricting (fourth day) I got this brown vaginal discharge (maybe old blood idk) and I was wondering if there's anything really wrong? I had just finished my period 3 days before the discharge came and it's still coming and it's been about a week. Also is it normal that I haven't pooped at all because I've been eating so little or is something wrong??????? Ps I've been taking this new multi vitamin here's the link http://m.nowfoods.com/Multi-Food-1-90-Tablets.htm and I was wondering if it's maybe the cause or if I should stop taking if since I haven't pooped at all

Thanks, jenn