I Went Into The ER On Wednesday For Sharp Chest

I went into the ER on Wednesday for sharp chest pain, & diarrhea. They took blood, and did an EKG. The EKG was normal and they said blood test came back ok. They told me I could have Gastritis and gave me a prescription for Prilosec. Told me to take it for eight weeks and if symptoms persists to come back. I have had diarrhea for 6 days now and I don't know what to do