I have had vertigo for 2 months(It started within the first minute of being on a treadmill. I was working out on a treadmill for 2-3 days a week for 5+ years). Doctor prescribed steriods and antivert for 6 days. While taking the prescription, I got diarrhea. I am still dealing with the vertigo, and often still have diarrhea(sometimes my bowel movements are normal, sometimes mostly water, and sometimes in between). Had MRI, and no issues with the brain, etc. Had stress and echo tests, and no problems indicated. I walk up to 8 miles outside a day a few days a week(I still haven't gone back on a treadmill). What are some possible causes, and where should I go from here?