Aaa! Nipple STING! ouch!

Ally-de-Cali
Does anyone experience a sharp stabbing nipple sting? I got it today while my baby was nursing. NOT the let-down stinging kind, the really sharp stabbing shooting needle-through-your-nipple kind of sting.
It makes me jump up when it happens and it is only my left side, which is the sorest. My baby is 4 weeks now. Please share your experience. TIA!