I had done massage, and still try to if I can but that's rare. I found it helpful in relieving stress At time, but triggering at others.
If focusing on your body is so stressful, is there anything you can to to try to relax around that? I know for myself, focusing on my body causes a whole bunch of anxiety and had a similar reaction of tensing up as a result. I have had progressive muscle relaxation recommended to me, but even that goes haywire sometimes (I can't seem to get my muscles to relax after tensing them, and tensing certain groups triggers flashbacks).
Sorry I don't have much by way of positive experience or advice. I guess I'm realizing a relate quite a bit tough...