Hi I Was In India From Last Whole Month Went

Hi I was in India from last whole month went to jindal nature cure
Was put on fruits & steamed vegetable diet but strangely I got constipated and my stomach looked swollen
I was given buttermilk in the morning and chhach twice with meals including soups and juices all day
But couldn't get rid of difficult bowel movement after leaving jindal I pretty much continued with the same problem and everyone asked why my belly looks big!
10 days after I suddenly felt pain in my left lowest part of abdomen which kept increasing very fast and I was crying with severe pain no otc med worked I went to bathroom 3 times and was able to pass stool but still pain kept escalating & I started throwing up so I was taken to hospital
They did x Ray sono & blood test
Only blood test showed some infection
They started me with antibiotics it's been 5 days now & Im passing stool very often ( no diarrhea)
I still feel nausea stomach pain & heavy lower back pain
My question is what could be causing this as doctors couldn't tell me anything