Hello. I have been into urgent care twice over the last few months for the same thing. I have severe pain in my left side for what feels like a tennis ball sized area and it hurts to put pressure on my stomach, it almost feels as if my intestines are swollen. All Kaisers told me is to drink more water, put a heating pad on it and take some pain meds. The pain usually last anywhere from 7-10 days then goes away. Something is not right. The dr thought maybe gal bladder but I dont have a fever when this happens just chills.