I can relate to you in several ways.
Congratulations on your 8 year recovery :) I am also recovered from anorexia and bulimia, for about a year, and I have only recently been diagnosed with insulin resistance/prediabetes. I can definitely relate to how dreadful it feels to be overweight and obese after having been anorexic ... even though I know I am healthy(er) in recovery every now and then I can't help but think of myself as a "failure" or that I've "let myself go" with all this weight. Sometimes I feel so guilty as if my eating disorders caused my blood sugar problems (even though I have a strong genetic link to diabetes).
I am also getting married in the spring - my wedding is at the beginning of June! I know it is hard but try to ignore and question the extra pressure. Tell people you aren't interested in talking about weight. Read up on the "health at every size" and body acceptance movements if you haven't already. Immerse yourself in them. Your fiance is marrying you because he loves you ... not a skinnier version of you. You are going to look absolutely stunning at your wedding ... promise :)