Kathy,
I was T Boned by a semi, and got rsd and tos (brachial plexus type), and Dr S, in Philly told me it's a common set of injuries. (Yea, well he's real smart). While other docs scratched their heads. Anyway, TOS can have effects that go up and cause monster headaches, and, down your arms, causing ulnar nerve and carpel tunnel. (all of which I have). There may be more. I do know that when I use my arms for strength, it can trigger a migraine. Or, worse, cluster HA. As I said, the lidocaine patches do work well. And, I take imetrex and other similar meds for the headaches.
That was in 83, then in 98, another accident, traumatic brain injury subdural hematoma, and four discs (two in neck, two low back) I actually heard them 'click' before I lost consciousness.
Now, I wonder how my head stays on, or up! Hah!

The nasty thing, is that back in 83, it took me 7 years to get a diagnoses, and it started with a chiro, who had another patient with lupus/rsd, seeing Dr Schwartzman.
Luckily, he was able to get me in within weeks!

I wish you, and everyone well!

pete
asb