Not a doctor but 80% of the time you're looking at some sort of nerve problem if you're getting that tingly sensation, particularly given your history of back pain. Seek medical help asap if you haven't done so already
I could be better than a doctor if I could write prescriptions.
I'm an expert on tingly. I diagnosed Brian Williams on a mere TV interview, 3rd-party. Lots of folks running for Pres, any one of them could be the cause. The cure is about two years. Except if I get elected it'll be cured in one day. lol.
Seriously. . . .most likely it is blood circulation, second most it could be nerves. Get your blood sugar/tolerance checked. It doesn't cost much to do that, and that is the real danger in delay. Do not put it off.