GingerV is giving some good advice here, many times we connect extreme moments in our lives to our sexual responses - its a subconsious connection and a very human one. It is good that you have come to the point where you are asking the question, usually that means that you've healed enough to be able to move to the next stage of healing. If your finances are no such that you can afford extensive psychological help, you may try contacting the local rape helpline or rape crisis center, they can probably refer you to a "group" that you can meet with and discuss your feelings and hear about what others are experiencing as well ... it is a huge help to come to that full recognition that you are not reacting strangely but that others feel much the same as you and react as you do. It is also helpful to hear the choices that have or haven't worked to help them deal with it.

Best of luck in coming to a place where you can find sexual satisfaction in a way that is acceptable to you.