This disease is hard enough to deal with, and when you throw in the weight gain/weight loss it is even harder to deal with.
I find that it is very hard to deal with my self-image and feelings that it brings out. I tend to yo-yo in my weight with this DD and I find it very hard to be comfortable with myself (imagewise) when I loose weight and people make comments on it. I have gotten comments that "you loose weight so easily, how does that work" - being said sarcastically to me, and then trying to explain it, people look at me like I have 10 heads.
I also find it hard to deal with over the past few years that when I have gotten stable that I find myself feeling huge (I am not really), but it how I see MYSELF. I find the feelings of insecurity of myself and how I look and see myself are hard to deal with - I will admit, it really can root inside you.
Just a suggestion if you can do it (and afford it) - it is really been helpful for me to see a counselor for the past few months (and I will continue) to help me deal with all my health issues and the things that stem from that - this DD (and the others that I have) can take a hold on ALL aspects of your life, it touches EVERYTHING.