lavica, please get the Divorce Busting book (even from the library) and first of all read the chapter on infidelity. (even if this was an assault, you are still feeling the same things that you would feel if it was an infidelity. so you need to read it.)
then read the pages on "thought stopping" (p 205-206). then read the rest of the book.
it will help you a lot! it will give you tools to cope.