Its most likely your blood sugar. I got that a lot around the same time. You should try eating something when you first start feeling that way. My blood sugar was always too low and I would get really dizzy and black out with the nausea.
Yea thts the first time it happen to me.
That happens to me all the time I dont know what it is though. Ive fainted at a store before because the standing straight for along time makes me sick. A gentleman told me to sit and he would wait in line for me. I was sooo grateful.
Thats pretty crazy! Maybe u have high blood pressure?! Call the hospital or ur doc if u can!