Extreme nausea after af ended?

Janelle

AF started the night before Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>, it was light. On Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> it was still light. On Christmas Day it was EXTREMELY heavy. So heavy that I thought I was gonna have to go to hospital or something (bled through super plus tampons in 20 mins) but throughout the day it returned to a normal like flow. And then the rest of my period was normal & ended normally. AF ended around Thursday-Friday. I had unprotected sex twice yesterday and ever since lastnight I've been suffering from bad nausea. No vomiting, but just out of no where nausea. Smells have been throwing me off & I don't really know what to eat. The nausea gets worse at night. I also suffer from car sickness and it feels like I've been riding in a car for hours. My stomach just feels empty & weak. Thinking about the wrong foods or smells could send vomit out of my mouth any second. Why sudden nausea? There hasn't been a change in anything except for me having sex lastnight but I didn't have sex today and the nausea is even worse tonight.

*This was also the only month that I had PMS symptoms. I used to get really bad PMS symptoms every month before AF but I randomly stopped getting them 3 months ago. So this is the first time in 3 months that I've gotten PMS symptoms (sore boobs, mood swings, cravings)*