I got a sore throat for the first couple weeks after
vaping, and still do if I go too long without taking a drink or something (often on lunch break at work where I'm outside just vaping away). But after a short adjustment period I don't really notice anything anymore. Another thing I noticed is that my respiratory system is a lot drier now. My coughs, throat clearing, etc are all dry instead of being full of phlegm. At first I found it painful but now I don't even notice it anymore, and I'm sure it's a good thing
Theres also a slight chance of a pg allergy but I wouldn't jump to that conclusion right away. I also suspected that to be the case early on but alas, not so. I still do prefer my mixes with more VG though. Even though it doesn't give me huge problems anymore, I just don't like the th I get from PG at all. Give me just enough to know I've inhaled something other than air and I'm happy.
Above all if your throat is feeling
swollen and you find it hard to breath at all I would just stop immediately perhaps consulting a doctor before you try again.