I'm Worried, i am 22 and i have a history of asthma. Recently however, i have been experiencing an unusual sharp pain on the left side of my chest that gets worst when I take deep breaths (kinda feels like a pop) or make any sudden movements. It does not get better with any asthma treatments and I have made 2 trips to the ER already (3 days apart) but both times they have found NOTHING WRONG. I had EKG`s and chest X-rays performed on me but nothing was found. These pains have been getting worst in the middle of the night. No Other symptoms though besides these sharp pains. What can it be? should i make another trip to the hospital?