Omg i feel horrible!

I'll be 36 weeks tomorrow and I suddenly started feeling so ill. I was watching TV with my niece and nephew and started to feel a little nauseous but didn't think much of it because it sometimes happens so it came time for me to take them home and the nausea gradually started to get a little worst but I still took them home and on the car ride there I started feeling really nauseous and just plain horrible. I'm now home and on the potty with diarrhea (sorry for the tmi) and I still feel nauseous and just terrible. It came on so fast so I don't know what's going on. I felt fine an hour ago and now I have the poops and I'm super nauseous, like wth.. (Not to mention I keep belching)