I'm miserable, please help?

All morning I've had the worst diarrhea and feel nauseous like it's just pure water that's coming out and I don't know what to do to make it stop. I have some anti-diarrhea pills in my purse but I think I may be pregnant so I probly can't take those. Just like this past week I've gotten a lot more nauseous and I've either constipated or when I am able to go it's diarrhea and today it's been the worst of it all. I don't know what I could do to make it stop or what I'd be able to take to help. Most times I feel as if I'm gonna throw up while going to the bathroom, it's just been pretty rough for me lately.
I'm miserable, please help?
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