36 weeks and feel like death

Help! Im 36 weeks. I was at work yesterday and ate the other half of a patty melt around 5:30 then came home and took some tylenol at 8:30. Started feeling nauseated about 9:30 and have been since last night. I puked last night but havent today yet because i slept until noon. (I usually only sleep until about 8:30) My back is hurting something terrible and tylenol did not help any and have mild like cramps (a little). My head is pounding.. What is going on i feel like death 😭😭