My prayers are with you! Vknusta! I've had this rsd for 30 years full body. You must be strong, and have faith!
Yes, it can and will spread. as a matter of fact, I always thought of it as how weird it would be, if just a part of my body had it? I kind of feel 0ddly that my entire body hurts. Anyway, I don't know where you live, in the US, get in line for SS! The longer you wait, the more you lose.
And, find the finest doctors you can!
Even though they can't do much, (this is very much a cancer type disease) without the death, just the agony. You must keep moving, and keep praying!
Pete