My heart reaches out to you man. Remember the most important thing is to have emotional intimacy.
As for sexual outlet since the love of your life's body is rebelling against her in the most horrible ways.
Mutual Masturbation is something you both should work on together. The other aspect is you need to look at full ranges of sexuality between two human beings where it might not make you comfortable.
Life is about experiencing all things.
For those with migraine suffering, love lovemaking making could be a blindfold with heat or ice to help the headache, and you learning how to massage the organs of her skin and scalp, liaslikeke she would lovingly do to you to get your ready for the main event.
As for you if you are man enough to look there are sensations you can look to have done to you where she can reverse it up and make you experience feelings sans intercourse which ends in an orgasm for you.
The thing is since she is sensitive (not her fault) you need for her to lead down the path, and she needs to realize she is wonderful and powerful she needs to adjust her sexual desire patterns.
Orgasms and foreplay release natural chemicals which thatremove pain and stress. I found this out in my travels through my trauma and pain, so what have you got to lose.
Now I say this as friendly advice, and respect any decision you make.