upper left abdominal pain

about 2 weeks ago i was out and ad about 3 beers about 2 hours after i got this severe pain under ribs 9-12, it was so painful i couldn't sleep lying on my left side seemed to make it worse, i went to the doctor the next day and she said nothing was swollen she prescribed me pain medication and muscle relaxants, and said to come back if the pain was still there in about 2 days, so 2 days came around and the pain was gone..
this was a monday and on the friday  i had one beer after college and didnt think anything of it, about 2 hours later or so, the pain came back less severe, it was the weekend so i couldnt go to the doctor.
this was one weeks ago and today i have an exam so im quite stressed and the pain has come back  again not as severe but i m worried it will worsen over the weekend..
its like a stabbing pain very localized to the left side, does make a difference with movement,, ususally worse
bowel movements are fine, had muscualr pain on the left side of my back and side for about 2 weeks beofre kind of more of a discomfort than a pain
any ideas what could be causing this??

[springyes]

Have no idea what it is but I get the same pain along my left side.  I have had it for months seems to ease up when I am awake but when I lie down it gets worse.  It almost feels like a stitch in your side when you run after eating.  I get alot of gas with it at night, very neaseated by morning.  My doctor says I have to see gastroentologist but that will take a year.