Suggest Remedies For Recurring Diarrhea

I suffer from recurring one off diarrhoea, by which I mean every once or twice a month I would have one bowel movement of diarrhoea and after would be completely fine until the next few weeks. It often starts with horrible abdominal pains which would immediately go after I go to the toilet. I wondered if it was IBS since a notable time it hapened was just before boarding a plane, however it can also happen when I am comfortable in my own home with no plans or worries. As for food I might have eaten, there is nothing I can think of which I have eaten before every time which may be the cause. This is very annoying and would like to understand what it is.