Your symptoms matched mine almost perfectly, but I found out that it wasn't the PG, it was something else that was specific to certain vendors. I still don't know what it was, and I still can't vape over about 20%PG (I get killer migraines if it's higher, and it makes me sick, sinus issues, sore throat, etc.), but after I tried a PG free line from one vendor and still broke out, I started eliminating those vendors from my stash.
So while it very well might be a PG allergy, and I highly recommend trying an all VG juice (Velvet Cloud Vapor, Potion Vape, maybe Highbrow Vapor, etc.), it might be something else. I suggest not ordering more than a sampler pack or a couple of flavors from any vendor until you know for sure that it's PG causing it, that way you don't lose too much money trying new things to see what works.
For a good starting point for VG vendors, check out this
blog post. Good luck, and I really hope you find something that works for you!