stomach pain

[gemmt]

4 days ago i got severe lower stomach pain  that lasted a few hours along with vomiting  diarrhea and cold sweats then got so cold i was shaking but since then i  have this dull pain in my stomach were my belly button is it actually feels like a rock is in there  most of the time if i move it hurts more and it even feels sore  to touch that part of my stomach sometimes standing  if  i stand up to long i feel i will faint does any one know if this is normal ad what could it be :(