There are Physical Therapists that are trained specifically in treating MFP, maybe one might be able to help.
I'm so sorry you're going through this. Yes, I've read that it can cause depression. I would imagine it's because of the severe pain. Many of us that have chronic pain also have depression.
Can you say what treatments you're getting? There are several, including massage, physical therapy, pain medications, inflammatory medications and antidepressants.
We're here to listen and to help anyway we can.