Last night at about 10 l

 at night I had ate three pieces of pizza and a Greek salad at about 11 o'clock I started getting severe pains in my lower stomach to the point I couldn't walk go to the washroom nothing so I just went to bed woke up at 3 AM puking and the same pain again at 5:30 and then again at 7:30 . The pain is still there it's not 11:34 AM I will be going to the hospital today to figure it out but I was just wondering if anybody had any ideas of what this could be.

The pain: 

- right side/lower stomach severely bad to the point in crying 

-nausea

- fatigue 

- my back hurts a bit also 

It feels like a constant crane up is the only way I can actually explain it so that it makes sense but it's like kind of under my bellybutton but a little bit to the right.. 

i'm scared I'm sore I would really appreciate anybody's personally experienced anything similar to this thanks 

PS 

it hurts so bad that even when my kitten goes to put his paw on my stomach it hurts