I understand the feeling well. I had to stop getting massages because I would be screwed up for days. It was so hard for me to believe that something I love so much and that I felt would be so healing could actually hurt me so much. It would feel good during, but then with in an hour or two after I would be a wreck with all my symptoms exacerbated.

I am much better since I stopped going.

I think it stirs up what ever your body (the systems that are working well) are trying to contain by moving the lymph all around. That would normally be good but for us I think there is some type of pathogen that is wreaking havoc. That's just what I think. Maybe it's a crazy theory, but nevertheless its the only way to explain how it makes me feel.
As far as that terrible shaking, I lie on the floor with my arms spread out and just meditate and it helps a lot to calm the muscles. When it is so bad that nothing works, I take medication.