I had my last meal at 7pm last night & today I ate leftover pizza. I can't tell you how nauseous…

I had my last meal at 7pm last night & today I ate leftover pizza. I can't tell you how nauseous I've been since yesterday night! I can't throw up but I feel it stuck in my throat. I'm having severe headaches, and dizziness. I've been drinking only water to keep everything down. But nothing is helping. Yesterday I took Tylenol &' it only helped some. But it all came back again. Cant wait until Monday. 😔😔