I don't think you are a nag. I think you are under appreciated for all you do. Your hubby is taking for granted that your life is on call 24-7, his is only 8 hours a day, 5 days a week.

If he can't understand your side, maybe a marriage counselor would help a bit? It isn't bad to go to one, its just maintaining an imporant relationship. Comments like the one about your sister was meant to hurt you...that's not positive behavior for a spouse.

Hope things get better.