how often do you throw up straight stomach acid

Yeah I'ma nurse and @isern-i-phail is right, add like 1/2 or 1/4 tsp to half a glass of warm water so it readily dissolves.

Otherwise you can try taking one or two Benadryl/diphenhydramine (the allergy medicine) and that's also an effective anti-emetic/anti-nausea. It might sound weird but a lot of anti-nausea meds work by blocking histamine which plays a large part in nausea/vomiting, and benedryl is actually used as a control for testing new anti-nausea drugs because it's still quite effective. You can also let it dissolve under your tongue and it will still absorb (but it will taste terrible/bitter), useful though in case you can't keep anything down. Alternatively you can try getting it a little wet and boofing it lol.

You might try calling your docs office to see if they'll write you a script for promethazine or (even better zofran.) A lot of them will do it without an appointment if you just ask them directly for the med and tell them you've safely taken it before.

it will taste like shit but hopefully make you feel better