I feel.. like shit. Am I overreacting?

I’ve been working for 2 months (was a sahm) SO works nights so I’m really stretched out! I barely eat now I’m always too busy. Anyway I’m the kind of person who has sex in the dark. Well because of the busy life I got I’ve lost some weight not that I was big anyway. So I took the plunge and had sex in the light with SO feeling totally uncomfortable but happy I done it he later he made a comment about I should diet with him and pulls at my loose belly skin. I feel awful now and embarrassed.