What Causes Dizziness And Nausea Along With Stomach Cramps?

I have been having some kind of attacks for a little over a year now. never know when they are coming.
I just get really dizzy…everything starts moving around really fast and I have to lay down with cold wash rag on my face. Get nauseated and stomach start cramping and I usually have to throw up and go to bath
room……I feel like I am going to pass out but have not passed out yet. I get really hot and sweaty. It last anywhere from 10 minutes to 30 or so. After throwing up and going to bath room I usually have to laly down with cold rag on my face for a while. I have been checked for vertigo and do not have that. I also had a MRI on my brain by a neurologist and he said things come back ok……Where do I go from here to find out what is going on. I have also gone to a cardiologist and have been put on atennol .25 mg. for an irregular heart beat. Cardiologist also did a stess test with ultrasound and found nothing….My left side of my neck hurts a lot and gives me problems working out but I keep on working out 4 days a week.