Gastric Byp Surgery...I am scared, but need it!?

I am supposed to have surgery hopefully by Sept. However, food is my drug of choice. I feel scared, like will I die from insanity when i can no longer eat all the foods I love? The weight loss is very necessary as I am in a wheelchair and hitting 300 pds from non-activity. I had a stroke at 28, you think knowing that would give me the boost to master this procedure, but what do I do then?