Another thing - how you feel, personality-wise, that is all changeable, due to many factors, etc. etc. and you can control it to a large extent.

Diabetes? Once you got it, you got it for life and you cannot undo it. So after that big of a weight gain, the first course of action is to see an endocrinologist about diabetes prevention. And personality you will figure out in a little while without rushing yourself - at least it is not something that will haunt you forever.

Very few diseases are worse than diabetes.