I know what you're feeling to an extent, I didn't feel like a *****, but I felt angry at him. I know that sex is a normal desire, but not only did the meds I was on at the time rob me of my desire, but it also made me numb from the waist down. I remember one time I flared out at said "this isn't even worth the mess!"

The only thing I can suggest is trying different meds, and letting him know that it's not him, that it really is you.