I have had daily, and almost constant nausea for 6 weeks, beginning just before my last period, which was especially heavy and I had bad PMT too.
First visit to the doctors and I was prescribed omeprazole (a PPI), in case it was acid reflux or irritated stomach. This helped a bit, the nausea went away in the evenings. I saw another doc last week, and she took me off the omeprazole and onto Compazine (an anti nausea med). This isnt really working and I felt much better on the omeprazole.

I don't have any other symtpoms - still a good appetite, bowels normal (though maybe passing through a bit 'fast' after breakfast!) and just slight stomach aches.

Now yesterday i realised that i am over a week late with my period, so Ive done 2 tests, both clearly negative. What's going on? Something hormonal maybe? I'm fed up, unable to work properly, unmotivated and worried..