I had my first BAD experience with sciatic symptoms last night - scared the heck out of me too.
Note, I haven't been having any problems for a while now, no pain, occasional numbness, always in my big toe.
Last night after a workout I was lying in bed, on my side, pillow between my legs, when my foot got warm, then hot, then tingling, then the heat and tingling burned up my leg and into my pelvis and finally my lower back. I sat up immediately and PooF! instantly the sensation was all gone. So I flipped over to the other side and didn't have any other problems.
I wasn't expecting the pain and tingling to vanish to suddenly so I'm wondering if my sciatic symptoms might be caused by my screwed up SI joint. Cause my Sacro-illiac joint hurts bad this morning, and my leg is partially numb and warm this morning.