I don't pretend to be an expert in this area, but I do believe that arts such as aikido provide a safe and controlled venue for working through personal challenges such as touch aversion. I'm not sure, though, that it's a good idea to try to accomplish this on one's own. While it isn't necessary to tell your teacher your whole story, it might be productive to tell him that you have problems with touch aversion that you are seeking to overcome, and let him help you devise a way to work through it within the context of aikido training. Having an ally in your training will make your burden a lot lighter, IMO and IME.
I think this is sage advice to "Survivor" and hopefully she will find a way of expressing this to her teacher. If nothing else, aikido teaches us to relax on contact, where a normal reaction would be to tense up, resist or retreat and from this relaxed and centered state, deal with the problem/issue at hand.
I think that over time, with patience and a commitment to work with the inevitable discomfort, then a stronger, healthier state can be achieved.