Rickajho, I get nauseous after the first half dozen vapes of the day with THIS particular e-liquid.
Only this particular liquid? If that's true you have to start figuring out what's different.
Is it the same PG/VG ratio as the other liquids that you don't have a problem with? Or is there more - or less - PG in this one? If it's the same PG/VG ratio skip down. \/ If there's more PG in this liquid than the other stuff you don't have a problem with, start suspecting you have an issue with PG.
Is this one liquid from a different vendor than the other stuff you don't have any problems with? Or is this one from the same place? If it's a different vendor you might be having a reaction to either this flavoring, or some other additive(s) in the liquid this places uses, but your 'ok' liquids don't have. If it's from the same place, start suspecting an allergy to this specific flavoring.
I am assuming this is the same nic level as your other liquids. But are you having any other 'adverse' reactions to this liquid, like palpitations, nervousness or difficulty sleeping? If you aren't vaping tons more of this stuff compared to your other liquids and don't have any added symptoms, it's still sounding like an allergic reaction to something. If the nausea is only with this one liquid,
and you have added symptoms, there is a possibility you actually got a higher nic level than you ordered. It's rare - but mistakes do happen.
Since your symptoms come on so quickly I personally suspect an allergic reaction. The big question is if it's a reaction to PG or a reaction to just the flavoring itself. Take a look at the process elimination above and it may help you narrow things down. If you wanted to be 100% sure, the only way to really know would be to get that same flavor, but in a 100% VG version - if that's a possibility.