9 weeks and Diarrhea

I have had diarrhea for the past 4 days now and been waking up through the night to go at least 3-4 times. It's followed with strong gassy cramps I've been taking gas ex, tums, and immodole nothing seems to be working or helping me. I have zero appetite and I'm trying to stay up with my liquids so I don't get  dehydrated but even water cause me stomach aches.  Anyone else have this or know what I should do?