I started out with MBV
e-liquid, then switched exclusively to another vendor.
I've tried to vape the MBV stuff again afterwards, and it usually gives me a nauseous feeling now. I guess you just have to get used to the consistency of different vendor's juices. Once you've changed, it's hard to go back, at least for me it was.
I've tried
vaping straight 100% VG from the Vitamin Shoppe, but that makes me feel nauseous these days too.
In your case with the chest pains, it's definitely more serious though. Refrain from ever touching the suspected bottle again, unless you're throwing it away.