Raven1, I'm in agreement to say you may want to jump up your nicotine density for awhile, from 11mg now to maybe 18mg.....don't let the fact that you smoked light or ultra-light cigarettes has less to do with the amount of nicotine in them than the chemicals added to them. The dirty little secret from Big Tobacco is that even with less nicotine, say for example they would add some formaldehyde which would in effect make the nicotine behave more like a free-base dose of nicotine.....you were still getting far more of A HIT than that label suggested. Yes, they lied!
You're feeling queasy probably from the cigarettes, but a little 'flighty' stomach from the e-cig, then my suggestion would be to increase the nicotine for awhile, until you find your comfort level.
After that happens, maybe in a month or so, start dropping the nicotine back down. You will not believe how painless and fret-free it can be. During the first month or two you may have an 'energy' spike, sort of nervous stomach. That is withdrawal, also, I was starving to death! Had to really watch that.
I stopped a 3-pack a day 'light' cigarette habit on day one. I used 24mg juice for a month or two, then went down to 18mg, with NO withdrawal, now down to 12mg with NO withdrawal. So, now tell me, are we addicted to nicotine, or to the 'rest' of the cigarette and the act of inhalation. Serious questions. Everyone has variable symptoms, of course, but do work on some deep breathing exercises to help clear out your lungs. Watch over-eating, and do drink PLENTY of plain H2O.
Best of luck!