Do I really need to go to the doctor

So I've had watery diarrhea for like a week and a day now. It went away one day last week and now is back. My stomach hurts when I wake up and when I'm going. I haven't been watching what I eat so maybe I need to start and I drink a ton of water. I've been taking immodium and that helps. Usually this goes away on its own...so im worried its gone on for over a week now. Online it says if it last more than 2 days. I have no other symptoms....and im wondering if its just my period about to start. I used to get bad diarrhea before my periods and haven't had one yet. I have no insurance so im just wondering...have you gone to the doctors just for loose stools?