Can't decide if surgery is right for me

Please help....I'm 75 lbs overweight, but keep gaining at a rate of 2 - 3 lbs per week. I have cancer (brain tumor) that has been stable for 7 years! Hooray.....bad part is the residual damage from the surgery (craniotomy) and radiation. I've got partial pituitary damage and some mild damage to the hypothalmus. I'm on thyroid medication also. I've gained a total of 50 lbs since having the radiaiton and the doctors say it has to be because of failure in my endocrine system. I eat ALL the time. I'm never full and have no will power to say NO. I took diet pills when I was younger and they worked, now they don't. I did Atkins and felt so bad (hair loss/constant illness) that I quit and gained it all plus more back. If I'm not disiplined enough to say NO, can the surgery help me? My weight is a major issue in my marriage. I wear a size 14 and don't think I look as heavy as the scale says....what should I do?