Hi, I have been suffering bouts of the following symptoms since taking penicillian for about 3 weeks back in July - constipation, diahorrea - so bad it is just foul smelling water, increased wind, stomach aches, stomach rumblings and a few days ago the symptons were so bad I had terrible back ache, weary legs and just felt so ill. Could this be IBS and if so could it have been triggered by the pencillian?