How do I make him understand what I'm going through?

My hubby loves how I make him feel, but I'm going through some rough times physically. I don't think men understand that women go through changes as they get older. It's not that I don't want to be with him intimately, but I'm having female issues (long menstrual cycles and cramping) and I really don't feel like being with him that way. I'm a very supportive and faithful wife. I make sure he has a clean home, clean clothes and home cooked meals, but I don't feel good. I told him that, but he's acting like I'm doing something behind his back....and I'm definitely not. Maybe he needs a letter from the doctor......or become a little more compassionate. I'm pre-menopausal and I'm ready to hurt him.