Hi and welcome to the GERD forum.
....are u sure it is the Prilosec that is making u vomit? Were u able to eat b4 taking the pill with out vomiting?
And if that is the case it is deff the pill, did u call ur Dr? If not, stop taking the pill call ur Dr to see if there is something else u might take....
In addition to the pill, have u modified ur diet?