I feel like SHIT

I'm feeling extremely dizzy and nauseas like I'm about to pass out ....normally I get that feeling sometimes only when I'm standing up and it goes away when I sit or lay down. It started today when I was sitting down at work maybe I'm dehydrated i dont know 😫 I had a huge thing of green tea (brewed my me) and a bottle of water. I think I'm 4 or 5 days DPO so I know it's definetly not that