The numbness/tingling sensation in arms/legs might be caused by nerve damage or pinched nerves. Ever had any spinal column injuries?
You can pick up an in-expensive blood pressure monitor at wallyworld or walgreens, or you probably have some middle-aged friends or relatives that have one that you might borrow. Try checking your blood pressure when you're sitting around, relaxed, and NOT stoned. THen check it again sometime after you've recently done a few rips. This is NOT a substitute for getting a check-up by a real doc, but it would arm you with some interesting information to take to the doc.