Can anyone help? Why these symptoms?

For the past couple days I've been very nauseated,sensitive to smells on and off. Today I was nauseous this morning but after a couple hours it went away. Like nauseous,feeling like any moment I will vomit. Came home this evening head is spinning headache, feeling flushed, no fever, horrible nausea again and diarrhea. Can't get myself comfortable no matter what I do. I still have 9days before AF is due and I have no idea when I ovulated. I'm not on any bc and have been ttc for over two years so I doubt I'm pregnant. I will test in the AM but could it be too soon? Any idea what else it could be? I'm not abnormally stressed, or ate anything weird, I don't think it's a stomach bug bc its on and off and nobody around me is sick? Please help if you can!

Many thanks