Does Stress Causes Dizziness And Vomiting?

Hello, I am 32 years old woman. Past 3 years I have been having dizziness spells, following by vomiting. The spells last anywhere between 1-5 minutes and the minute I vomit the dizziness goes away. Lately, I noticed that it happens only in the mornings: the second I open up my eyes, I feel that I need to use the bathroom (#2), and then it starts, I feel like someone is messing with my brain, like someone mixes my brain with a spoon or something, the I force myself to vomit and it goes away. If I try to move or get up during that, the dizziness gets worse and the whole room spins and I feel like I am rolling down the mountain or something. After the spells I have a feeling that everything moves from side to side for another minute to two, then I have to rest from half an hour for 2-3 hours (sleep or stay in bed depending how bad the spell was). I feel like that bowel movement & those spells are related. I have been to many doctors, had MRI done on my head, blood work is clean, checked ears & eyes, everything is OK. Doctors think it is stress related. tried acupuncture. Still get the spells. Please help. Thank you