stomach feels like being stabbed?

I got woke up at 4 o clock this morning with this pain tht overwhelmed I could hardly walk and had to take a bath but it didn't help after crying in pain it finally let up enough for me to go to sleep. Now after I've woken up it feels like the after effect of being punched in the belly. I've had this happan a couple times before in the past. What could be wrong with me? Also its on the the very bottom of my belly like the spot between my private and my belly button. Thanks.