Dr. repeated cpet + a new test thurs. to rule out mitochon. disease. they tightened a cuff on the lt arm to cut off circulation for 5mins. anyone heard of this test? i've had a headache, arm & neck pain since. dr. said no worries. but should i be?

Simple procedure : It’s called the forearm exercise test. In some mitochondrial and other diseases, pumping the forearm muscles in the absence of good blood flow will get nice extra lactic acid and cramps. I would continue to look for the cause of your pain and not attribute it to the procedure. These things tend to be hard to diagnose and hard to treat and I wish you luck.