question: i jumped into water that was much shallower that i thought & experienced sharp pain in upper chest. almost 2 weeks ago.  since then when i cough or sneeze or laugh or try to turn over in bed or get out of bed i get a sharp pain in upper chest.  any idea of what i did to myself? (i had a vius about 4 weeks ago and another 1 started the day after i hurt myself, so i need to cough but hold it back because of the pain)