Why does it burn when i .....?

i had my gall bladder out two weeks ago ...i still feel ruff.....on the 29th of jan 2009 i had key hole and had my gall bladder out with gall stones .next dat went home ...felt fine two days later had a attack with loads of pain ...back to a and e ....stayed in and on the third day had emeremancy .now i have a scar from my chest to my belly on ..told i had about a litre of bile inside me.had a drain fitted etc ...and hoped that was it ....but the next day had a camera in my mouth and i stent put in where i had a leak .....no am home still feeling weak ....i got to the toilet and my backside burns when i go to the loo ...am i doing something wrong ...do i need a diffrent diet ...please can anyone help is this normal ...........