I think most doctors would advise you not to have the surgery unless you felt 100% sure. It is irreversible.
However reading about it just now it sounds like a very good alternative. The only downside I can see is that it is possible for you to gain all the weight back unless you deal with your eating disorder.
Here's the pros and cons list:
Advantages
Restricts the amount of food the stomach can hold
Induces rapid and significant weight loss that comparative studies find similar to that of the Roux-en-Y gastric bypass. Weight loss of >50% for 3-5+ year data, and weight loss comparable to that of the bypass with maintenance of >50%
Requires no foreign objects (AGB), and no bypass or re-routing of the food stream (RYGB)
Involves a relatively short hospital stay of approximately 2 days
Causes favorable changes in gut hormones that suppress hunger, reduce appetite and improve satiety
Disadvantages
Is a non-reversible procedure
Has the potential for long-term vitamin deficiencies
Has a higher early complication rate than the AGB
Source: ASMBS
So your last-second panic, causing you to doubt everything, is something you really need to pay attention to. Personally, I could not wait for the day I had my surgery. I was excited, relieved, elated, hopeful, looking at the future, knowing I was going to be saved from Death by diabetes.
If I were you I would call my surgeon and tell him or her exactly how I feel. I know that in some cases it is possible to postpone, rather than cancel, the procedure.
There are a few members here who are having their procedures in April. I haven't heard any of them say they are rethinking it.
You may end up getting a lot of opinions from us, but honestly, we cannot advise you because we don't know you and we don't know how you feel about the future and the new body you will have in the new diet you will have to stick to for the rest of your life.
Have you experienced the jitters or anxiety on any other big threshold decisions of your life? I understand that sometimes people get the Jitters before they get married, but I didn't. Both my marriages end in divorce oh, but I was sure of my decision to marry!
How much do you trust yourself about making every decision in your life on a daily basis? I think you really have to ask yourself that question. But in the end, you really need to talk to your surgeon. Every single Medical website that talks about Bariatrics urges you to tell your doctor everything.
Either way, good luck.