I Have Been Experiencing Diarrhea For Two Days. It Started

I have been experiencing diarrhea for two days. It started out with a foamy vomit on Saturday morning along with the diarrhea. On Sunday it calmed down and after having some broth with some crackers in the morning and afternoon, I had a small portion of beef stew with 4 ozs of milk early evening. At 2:00 a.m. on Monday morning I awoke to severe diarrhea and have been experiencing bouts about every hour (urgent, without warning). Two questions: (1) I've not taken any liquid or solid today....What do I do about medications? (2) When and what should I eat or drink?
Mary