What’s happening

Guys help! I’m late for my period but I feel like I’m on it. I’m cramping and feeling nauseous, I’m eating everything and never feel full. I thought I got my period bcuz there was a tiny bit of blood but I put a tampon in for 8 hours and when I took it out there was only discharge. Idk what’s happening, I’ve been really stressed and not eating proper which could effect it but idk anymore. It’s weird bcuz I normally don’t cramp much but I’m sooo crampy lately!! Help!

O ya and I’m hella bloated too. And also I have some pain in my well uh...down there...it feels like a knife being stuck in it and turned around!!! Help I’m dying I swear