What medication is there to help this eating disorder I developed with seroquel?

I have been on seroquel for over a year and have put on an average of 17lbs.  Lately, I have been extremely hungry and unable to control my appetite.  I am wanting to get off of the seroquel but I find I can't get to sleep without the seroquel.  I have tried lamictal only to not be able to get the therapuetic dosage up as I taper off of seroquel.  I got down to 25mgs. of seroquel but needed to go up on the lamictal.  I could not get ahold of anyone and had to discontinue the lamictal.  I was up to 50mgs.  I was experiencing depression in the middle of my chest and back pain.  It was a horrible feeling in my chest.  Had to go back on the seroquel full strength.  Then I tried geodan and could not get to sleep.  Pdoc took me off cold turkey of the seroquel.  I could not get to sleep at all not even a wink for several days.  This scared me and I was at 40mgs. of geodan but had to discontinue it due to I could not get ahold of anyone at the Mental Health Center again to increase so I discontinued geodan and went back full strength on seroquel.  I am so depressed of this weightgain and miserable.  Any suggestions are appreciated. I just wish I could find a medication that helps sleep without the weightgain?!