Unexpected & frequent fainting episodes?

So I'm going to give you some background information first before getting into my fainting episodes. I'm 21 years old and have been dealing with bulimia since I was 17 years old. I've been trying my best to adopt healthy eating habits and not throw up after every meal but sometimes I just have to because I feel really guilty about what I've consumed. My boyfriend has been extremely supportive of my attempts at recovery & he constantly reassures me that I'm beautiful just the way I am. The problem is that I don't feel that way about myself at all. Regardless of how much weight I lose or how often people tell me that my body is fine the way it is, my perception is so completely different from theirs. I cry when I look in the mirror & don't really know how to truly love myself. I tend to trivialize how bad it is because I know my boyfriend has really been trying to help me. I hate that I'm being dishonest with him but something keeps driving me to continue my unhealthy patterns and fall back into old habits. I am so tired of lying & deceiving people (especially my boyfriend who encouraged me to seek help for my problems). My boyfriend knows me better than I know myself so he has been working out with me to keep an eye out for any signs that I'm reverting back to old behaviours. A week ago when I was on the treadmill I felt extremely weak/tired and just felt my legs give out from under me. It was really scary & he quickly got me water and said that I had blacked our for a few minutes. It happened a few days later when I was taking a shower & luckily he was home from work so he knew what to do. I have no idea why this keeps happening but I would really appreciate an explanation. Thank you so much!! :)
Unexpected & frequent fainting episodes?
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