TMI I'm not sure what's going on

Yesterday morning I woke up and I felt fine. I took a nap with my kids and all of a sudden I'm really nauseous, my stomach hurts/is cramping. I also had to poop, really bad. I ended up pooping 6 times yesterday. TMI here but it was incredibly liquidy. My lower back was hurting a lot along with my abdomen. I threw up twice yesterday and once again early this morning. I also had a really bad headache and no appetite. I could barely sleep last night.

This morning I was able to eat some yogurt but I still have this horrible back and lower abdominal pain. I also noticed blood in my pantiliner at 746am. I haven't had a period since January 2nd and that lasted 3 days. I had some random spotting throughout February.

I got really bad cramps in my sides and stomach while vomiting.