I feel your pain! Propylene glycol is involved in the processing of such a vast range of products that it feels like we're surrounded by it at all times. It's overwhelming! A big part of coping with this allergy involves keeping our environment fairly controlled and routine. This can be a huge life-change for adventurous people, but I try to find some comfort in the routine. I hope that one day our ingredients lists will progress a little further by not allowing hidden ingredients. I'm sure that would be a big change for any industry, but our health should be our priority, so it's worth it!
Hang in there - it does get easier! There will always be challenges with this allergy, but over time, it gets easier to accept and one day you'll be a PG-allergy pro!