Has anyone experienced this...

So my period was 3 days late. Not too unusual. But what was freaking me out was that I was having major head spins and nausea over these past days. I took a test it was negative. Period cake day after I took the test.

My flow came a little heavy like usual but then after a day has basically reduced to nothing! I’m still having the head spins and nausea and am also having dull stabbing pain in my right lower abdomen.

Sorry for the long post. I’m just wondering if anyone has experienced anything like this.