Definitely go see a gastroenterologist. In the meantime, keep taking the prilosec. With so much reflux and regurgitation going on, the prilosec will help prevent your esophogus from getting so inflamed with the stomach acids.
I would get a referal to a gastro. doctor. I have severe GERD and I don't even throw up. You probaby going to need a endoscopy for a diagnosed..... hope you feel better....