I have no problem with it, however...
I can eat whatever I want but not get fat, however I'm always hungry no matter what I eat so it's difficult. In elementary school I started thinking I was fat (no idea how, no one ever told me that) and I stopped eating in the cafeteria. Then one day I fainted in a starwell and hit my head on the corner of a showcase, but I still kept starving myself. I was like 45 kg then.
Then when I grew up and gained weight I freaked out over it and almost stopped eating at all... I'm 17 now and I still keep note of what I eat and what I won't, it's really tiring but it makes me feel better
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I have the opposite: I gain even when eating verry little/exersizing a lot/...
At first I didn't care about it and then i did so I started to eat less just to have a 'normal weight' instead of being 'overweight' so i started eating less and less and less untill the point I only ate 800 kcall a day to just stay on the 'normal weight' (normal weight is normal bmi btw so i didn't try to be really skinny or annything just 'average')
well the truth is I'm happen to be the opposite of you. I'm very picky with food and have a lot of allergies so I often don't eat. I have a small body compare people at my age and have a chronic gastritis. So I hope that I was you instead. I don't mind if I'm fat as long as I have a healty body.
Oh wow, I just looked it up and that really sucks.. I hope you get well, if there's any way.