I hope it's not sciatica. I had pain & numbness, and some shooting pains (like the pins&needles you mention) and it turned out to be a popped disk in my spine. Went undiagnosed for four months of no sitting (which also meant no driving cars, no eating at restaurants (or going on dates), no bicycling/kayaking/surfing/anything fun, and standing all day every day at work with trade manuals stacked under my monitor & keyboard. Also could sleep for only 3 hours at a time, had to get up and walk around in the middle of the night every night.
Two surgeries finally corrected it. And then stacking coins on my doorknob finally cured me of sleepwalking after the surgery.