Please HELP!

Lisa • 💙Mommy of 2 boys💙 & a daughter 💗 Pregnant 🤰🏻 with #4

I just got back from punta cana after being there 9 days and my stomach started cramping and having the poops about 4-5 days into the vacay. I just got back last night and my stomach is wrecked still!! Bad stomach pain and then the shits follow. Please help! Anyone know what's good to take?!?!?