Could be spinal nerves causing Thoracic Outlet syndrome. Look on line for MSK Neurology, he has his own website and is on facebook – a great guy who’s very clever in diagnosing people like you and me who have baffled drs for years. You could ask Dr to do digital motion x-rays to look for anything trapping blood flow or MRA which is MRI scan with dye to check blood vessels and arteries. If it’s not blood flow blocked or trapped it may just be nerves pinched. Shoulder impingement is another option I have that and it traps Subclavian artery like when I hold a phone to my ear and I feel faint. The only other thing I can think is Subclavian Steal Syndrome if it specifically when you use arms.
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