Hi,
I was diagnosed with Crohn's a little over 3 years ago. I also was VERY sick for quite a while until they found out what was wrong and brought it under control. I've had a couple small bouts since, mostly during the first year 1/2. I have since felt so good and yes gained all of my weight back PLUS. I eat everything in sight (except sausage and pepperoni and not alot of creamy stuff) I even stopped taking my medicine at one point because I thought "I was cured" Don't ever do that..no matter how good you feel for how long. It does come back. I recently had my gall bladder out which they said happens alot in people with Crohn (it happens alot in chunky women of childbearing years too, but who am i to say right?) Anyway, I have reduced my ASACOL here and there depending on my symptoms, but my case I'm convinved is minor compared to most I've read about. I hope yours is too. Be glad you're gaining weight, just not too much :-) You may need it someday.
Good Luck
Did they put you on steroids? That can make you gain weight. I don't know anything about hcg. Sorry.