thanks for bumping this up!

My left arm is affected:

Headaches worst ever
migraine auras and light sensitivity
neck pain (excruciating)
pain in armpit
pain inside elbow joint
pain in arm in general
weak grip of hand
constant tingling/numbness of hand usually ring and little finger but sometimes other 2 fingers and base of palm
numbness of outside of wrist
grey spots in vision
was getting bright flashing lights in vision a while back - this has now stopped
hearing problems - pains with certain sound pitches - left ear
veins sink in when raise arm
swelling of base of hand
awful vertigo sometimes with nausea
pain under shoulder blade and under collarbone
weakness and burning of arm if I lift anything
awful neck and head pain if I lie on my stomach with head raised
trembling of muscles in left arm
trembling of right thumb (now getting pain and aches in right arm)
(not sure if this is related but my head regularly feels peculiar - like my brain does a flip flop)