I am going through the same thing as you. Started with cramping and soreness in my calves and spred up to my arms about a month and a half after I was stung by somthing in the water at the beach.
I have had blood test after blood test to come back normal. I've seen GP, NERUO, REMUO! I've had MRI, EMG/NC all normal.
I asked my NERUO about BCFS and she said she had never heard of it! Also asked if it could have came from the sting and all said NO!
I am still having problems, but it seems to have peaked and leveled off. I also lost my job because of all the pain and missed time from work for the DR. visits and testing. I now have no income or insurance to add to my problems!
They have brought up Fibromyalgia , but from what I've read about this, it seems to move around from day to day, wk to wk. BCFS from what I've read seems to stay in the arms and legs mostly. (could be wrong!)