Not sure where to start but I am experiencing symptoms of diarrhea and constipation. When it is diarrhea I find that it sometimes may be accompanied with head ache, fatigue, chills, achey and mild nausea. It may knock me down for a day, sometimes two. No particular food intake seems to directly cause the diarrhea. Some events are without warning and quite drastic. I might go months without an event or it could be several over several months. Are these common symptoms for IBS?