TMI but need some advice!!

So this might be kind of gross for some people. I'm 19 weeks pregnant. For awhile

Now I haven't felt the best, sometimes feel like I might pass out. I've had cramping and then diarrhea. I feel like it's almost after every time I eat something. I have felt the baby move a tiny bit early on and now haven't felt it at all. I'm hoping maybe I just have a bug of some sort but I'm getting a little worried. Any one have this happen or have any advice? When this cramping starts I feel like I'll pass out if I don't sit down for a little bit and I've also been having really bad headaches.