it is unlikely that immodium has affacted your kidney. what is your serum creatinine
level and has it recently increased. MMF can produce diarrhoea
. did you resently start the medicine of increase its dose. SLE can affect almost all body organs, what were your involvements at diagnosis and wheather your are in remission or active disease. all this has to be considered to find out the caus of abdomin swelling and vomiting. you can follow up with your nephrologist
and he should be able to sort it out for you.