What Causes Dizziness And Vomiting?

Hi I m 26 years old and I am currently pregnant, about 11 weeks along. When I got pregnant with my daughter two years ago I started to have severe dizzy spells that were followed by vomitting. This not only lasted thru my first pregnancy but I had experienced this for over 2 years in between pregnancies. I had brought it up many times to my doctors and was ignored because they didn t see an issue. I call these episodes dizzy spells because that s the only thing I can compare it to... It is more of a physical feeling that starts in my stomach and works its way up to my head. It has always been random, sometimes multiple times a day and other are months apart. The feeling is so intense but only lasts a few minutes and is usually ending with vomitting. In between pregnancies it seemed like when this would happen I would stay seated and really still with my eyes closed and it would help stop the vomitting from happening. I ve done my research and understand most of the causes but I ve seen midwives, my Pcp, my obgyn and multiple other doctors with no luck for answers. Is there anything I should be worried about or does this seem to resemble anything medical? I d just like some sort of answer so I know whether I should be worried.