Diarrhea during period?

I've had my period for 3-4 years now and for the first time I have had diarrhea! My stomach has been hurting and I've had diarrhea for 3 days now! I never get headaches but I have this time and I have been having nausea! I think I might be dehydrated! And my body is not wanting liquids! Help please!!!!
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