Hello,
It is perfectly normal for people to have diarrea, in my case i get all the time but i have quite a serious case of IBS, so you got nothing to worry about, you've probably picked up a stomach bug from somewhere and you may need some antibiotics, or you may have got food poisoning and it hasn't cleared up yet, there are many reasons for diarrea, and it is extremely unlikely to be very serious but if it bothers you that much then go and see your Dr, and until then you should get some Imodium from your nearest pharmacy.
I hope this helps.