Roxy, don't think that's at all unusual for a new vaper. But I don't think it needs be altogether to do with the nic level ingested. We can be hyper-sensitized to anything we consume by stress and anxiety…as by suddenly realizing we just went
through a bunch of
juice! And yes, it can be accompanied by elevated BP, nausea, headache, etc. if you get there (and mebe really did). Had an incident similar to yours in the first couple of weeks
vaping. Realized it, was calm, but my body thought otherwise. Then a few days later went through a good part of a 12mg, 30ml bottle of Tribeca in just constantly vapin' all evening at low power (<10W, eVic))…no problems… and loved it. Still, an episode persists with symptoms multiplying or with acute pain at any time, I'd be lookin' to see an MD. There may be other issues accounting for the sensitivity.
Good luck!