Advice Needed. Unsure of What To Do!

Two days ago I was eating dinner and had a pain on my left side near my ribs/lower ribs. I shrugged it off and took ibuprofen and went to take a nap. I then woke up in excruciating pain. Worst pain I’ve ever experienced. I could barely walk, stand up straight, and it hurt to talk. I was miserable all night. I tried Tylenol and went back to bed. I woke up the next morning in the same excruciating pain to the point it had me crying because I couldn’t move. I went to urgent care and my UA was negative and chest x ray negative. Today, I still have this lingering pain in the same area. Sometimes it radiates to my left lower side but generally in the same spot. Nothing helps it, not even the muscle relaxer the urgent care doc gave me. The doctor said he isn’t sure why I’m having this pain. Do I got to the ER and get a CT? Ugh!! This is the worst!