I think Jim Davis has it right, at least it did for me: I had the exact same experience as you did. When I first started, I got the OD symptoms from 16 mg. I would be fine if I only took a puff or two then set it down, but because it was new, I was vaping constantly with my new "toy", only to make myself sick.
So after a month, I found two things have helped:
1. Cut my daytime use to 11mg
2. For nightime and long-session vaping, I drop to either 6 mg or 0 mg to keep from getting that sick/dizzy feeling.
I've also started treating this differently than an analog--if I get a craving, I take a few inhales and put it down and wait a couple of minutes. There isn't that immediate nic relief of an analog, but it is there after a minute or two. Once I got used to that, my routine changed and the nauseous feelings went away. Depending on my stress level, I may use it a couple of times an hour to once every few hours.