I'm fairly certain it's muscle pain. I'm experiencing it below the clavicle (sometimes I get sharper jabs of pain above it), down into the chest a little occasionally, on the tops of my shoulders, in the back of my shoulders... Doesn't seem like joint pain. Everything is just extremely tender and there's this deep, intense ache. The pain below the collarbone comes in waves, whereas the other pain is a bit more constant.

I got my first therapeutic massage tonight, but don't feel much difference (yet at least). God I wish I could just take the B12... I still need to purchase one of the other recommended kinds. I took a tiny bite off one of my 5000mcg Jarrow pills. I keep telling myself not to, because when these things make me out of breath, they REALLY make me out of breath. And it feels awful, but so does this pain...