You feel sick as a result of dopamine agonism from having dopamine kept available to the receptors, and dopamine is very effective in causing nausea, and in fact the medication i use to stop extreem nausea and vomiting all day, is an injection of the dopamine antagonist called phenergan or promethazine. I cant give you any of course but go to the doc and complain of nausea and you will get some probably its widely used.
Of couse if you use a dopamine antagonist you will prevent the effects of coke almost entirely i bet, its not REALLY strong at antagonism but its enough to block it i bet. Your better of not using coke or using another kind of anti-emetic such as weed, or maybe benadryl which wont affect the coke. Serotonin receptor HT-3 is very responsible for nausea and vomiting as well and many serotonin releasing drugs can cause vomiting as well, i usually puke on mdma and almost always have. There arent a lot of serotonin antagonists though i dont think.
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~The Recreational Pharmacist
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