Okay so I was laying down on the ground during naptime at work and when I tried to get up got…

Okay so I was laying down on the ground during naptime at work and when I tried to get up got absolute horrible plain around my belly button. I could not get up it was so painful. So when I finally got up and walked around it felt even worse. Called my doc office and the nurse is going to give me a call back. Anyone else have this ? It felt like stretching kinda.. But for about 5 mins. This happened on Sunday too.