Did they conduct a nerve conduction study, and EMG, check for an endocrinological cause, send you to a rheumatologist to check for
fibromyalgia?
Did any doctor check the peripheral vascular system with a doppler
study to see if your circulation is working properly in your legs? Peripheral vascular disease can be hereditary and I seem to remember reading it can strike even in one's teen years. If you have had a lipid panel that demonstrated high triglycerides, etc.