It isn't constant, but it comes on quick, lasts for 5-10 seconds only, then goes. And it is PAINFUL!
But when I'm standing/sitting, I feel fine. No pain. I'm just exhausted from no sleep.
Has anyone here gone through it? Any ideas on possible causes? My guess would be something got pulled and the muscle now aches, but I don't understand the frequent stabbing feeling - it left me in tears each time it happened! :(