I have been placed on oxycodone 15 mg 3 x daily, soma 350 w x daily, xanax 1.0 3 x daily, topomx 15 mg 2 x daily, imitrex 50 as needed, fluoxetine 20 mg 1 daily,citalopram 20 1 x daily. For the past two days I have been having waterway diarrhea. Could this be a medical reaction? My PCP believes that I may have IBS after being involved in a two car accident ten minutes apart almost 3 years ago.