Oh man, Lazarus, you're in a really tough situation. Talk about being in between a rock and a hard place (no pun intended there)!!
Blood pressure does rise with sexual activities, masturbation included. It's how erections happen and eventually the climax. However, going that long without doing so would be murder on me too.
I don't have a clear cut answer for you, I'm afraid, but know that you have my support in this difficult time. Also, you have my hugs.