Pain in abdomen as if wearing a really tight belt

[overthehill74]

I've had a shocker of a day trying to look after my DC and carry on as normal with such bad pains in my tummy. It's just to the left of my belly button and I can't bend down or anything. It feels like I have a really tight belt around my waist and it's agony. Has anyone any ideas what this could be? I have managed to get a doctors appointment for Monday morning but I really hope it's gone by then.