Is it a good idea for me to consider VSG now?

I am 48 years old and have spent my entire life yo-yo dieting. I have developed Fibromyalgia (?), vitamin and hormone deficiencies, and although I've been active in the past, I can't seem to push myself like I used to. The result is I'm gaining weight rapidly. Already up to 170 at 5'3". I feel as though I'm moving through wet cement with all this extra weight. I'm so tired of losing only to regain. However, this time, I can't seem to move enough to lose at all. Am I even a candidate for VSG?