I am also 19 years old and know just how you feel.I had my gall bladder removed a few weeks ago the reason for this surgery is that i had gall stones.A few days after the opperation i bagan experiencing excruciating pain in my right side and back like the pain before surgery and like you could hardly walk.I returned to hospital and i was admitted for a few days, they told me it was probably constipation!After doing various tests they concluded that the pain was probably just soreness after the op and sent me home.A week later i bagan getting this severe pain again and went to my local doctor who agreed that it was probably just soreness and gave me stronger painkillers.The pain went away for over a week however the last few days i have been in agony with the same pain.It lasts up to twenty minutes and when i breathe in, the pain is very sharp.I am quite worried however have reservations about returning to my doctor in case i sound paranoid!Like you i am only 19 and feel like i should be back to my old self.Has anybody got any ideas please ?