Hi - don't know if you're much of a reader or not but Not Just Friends by Shirley Glass was a huge help to me AND my husband. It lends a great insight into the A from ALL parties - OW included. I didn't even know that my H had read the whole thing until one day he mentioned it. I had it lying around the house and he picked it up and read it. He said it helped him as well. I'm not suggesting that you ask your H to read it, but you should. It really is helpful.
I think you need to take your time with this...it takes a long time to overcome this. Don't rush this. If sex makes you uncomfortable, don't have it. If you have stop in the middle, then stop. He needs to feel the consequences of his actions - maybe no sex for awhile is one of those. I'm not suggesting that you deliberatly withhold sex as a power play, but moreso that you listen to your wants, needs and desires. A result of his actions is your discomfort. Feel the discomfort and decide how to act.
Be patient with yourself WAS32 - just take it day by day.
EM
Me: 34 H: 39 M: 7 yrs H A 12/05-8/07
If what you say surprises me, I must have been assuming something else was true. - M. Wheatley