I seem to have a problem like that too, I ordered a while ago some 50% pg/ 50% vg, I read somewhere that many people are allergic to PG and I believe I am, I feel all odd, my thoat feels odd when I swallow, I can guarantee you that the feeling is not coming from withdrawl symptoms since I tried smoking it, started to feel like that pretty much right away, stopped, after a day or two it went away, then I tried again about a month later and felt the exact same way right away, then I just stopped and decided to try to find pure VG, since when it happens, my body just feels weird and I kind of feel like when I have allergies(I'm allergic to cats and dogs) so I strongly believe I'm allergic to PG, this is why I'm trying to find a supplier here in canada that sells pure VG, not so easy to find at the moment but hopefully being a member here will help me!