Why does my husband give me a guilt trip when we don't have ??

I really do have a problem here! I had surgery a few months ago and now I don't really have any drive at all. I am having some minor complications since my surgery and don't feel too good. I am seeing my doctor trying to work these things out but meanwhile all my husband cares about is the fact that he's not "getting any"! Were at once a week now and I have to force myself to do it then! Last night he left in the middle of the night after we were in the bed and said he went to get cig.s. I am having a hard time believing that one...What do you think? I didn't even know he was gone until the next morning when I saw our kids' favorite candy on the table and asked him, when did you leave and why? He at first said it was to get cig.s but then later said it was because he was mad at me because he wants more and I went to sleep!!He hasn't tried to understand how I feel after having a hysterectomy and I feel awful! Now I feel guilty on top of sadness and other medical issues.Help me!!