I experienced the same reaction when I first started using the cart/tank system.
I'm not allergic to either vg or pg, but my nic content was too high. It's always a good idea to have on hand either 100% vg or 100% pg (unflavored) to lower your nic level. I figured out that using a tank system, my nic requirements should be no higher than 18mg, and probably less depending on the juice type. That’s not necessarily the case with other delivery systems (dripping, straight carto, or bottom feeding).
BTW...my first M&P order left on Jan 20th with a boat load of juice...based on the delivery method I used into Canada, I should have the shipment this time next week...really looking forward to that