We have much helpful nfo on our TOS forum and the sticky threads there..
https://www.neurotalk.org/forum24/

It might be wise to find a vascular surgeon for a complete work up due to the losing pulse when hand are raised..
Have any xrays or MRIs been done, to check for bone anomalies or extra cervical ribs?
*You can copy your post here & also reply on the TOS forum if you want to make a thread there with additional information or questions.