What the hell..

20 days late for my period with no signs of AF showing up. All negative tests so far. I’ve had a super dry/sore throat for the past two-three days and today I’ve had the sudden urgency to just throw up. Nothing comes up, but this lump to get everything up remains. Any ideas? Before I started the pill I had very very irregular periods. But after a year of being on it I stopped using it because my periods had regulated and I’ve been normal for over a year and half, now suddenly going a month without doesn’t seem right.