I won't easily 'condemn' any e-smoke device: but please, first throw out that SuperSmoker (if you are within the guarantee-period: bring it back, ask for a refund: chances are very big that this device is only going to make you mad or sorry; and certainly poorer...); then see how it goes.
And yes, you cóuld be allergic to PG but that's really only a minority, most times there are other causes. For instance: you have to suck só darn hard on those SuperSmokers that your lungs almost turn inside out... that's bad for your veins too, plus for many users of this particular device their jaw- and neck-muscles actualy start to hurt soon using this device (all are possible starters for headaches)
As to PG getting your throat dry: that is a perfectly normal side-effect for the first week or few weeks with móst people starting on e-smoking; after that period of time it should slip away bit by bit. It does help to drink more then you usualy do when e-smoking, especially during the time you still see effects from PG.
The 'paint-fumes' could just be your having to get through the new period of your devices. If you are 'breaking in' 3 new devices at the same time... that could pretty much turn you off e-smoking indeed. Will mean you have at least a week (or more if you aren't a heavy smoker) of awful taste, before you have all 3 past that first period...
Then the 'feeling ill' in general: perhaps you are not taking into account that stopping with smoking tobacco (or severely lessening this) can cause quite a few symptoms during the first couple of weeks too? Those can last for 2 to 4 weeks. You are kicking the habit of inhaling 3000+ bad chemicals, even if you do still keep the nicotine... and that shows in your body (for some more severe then for others). Try to make the difference for yourself, what is happening because of e-smoking; and what is happening because of nót smoking tar and all the other chemicals: that could perhaps help a bit with your decisions on what route to take.
Hope you get this all solved, and will soon feel well... and then better then ever.