So I've been doing well for over a month now. ........But starting yesterday morning, my mouth and tongue are just super sore! It hurts to even roll my tongue. The sides feel un comfortable too.
THAT was the problem I experienced when I began vaping in 2009. After about a month, my mouth, throat and lungs were so sore I couldn't stand it. As a result, I quit vaping and went back to analogs, and it cleared up.
A month or two later, I tried vaping again, and same thing happened. So...still wanting to quit analogs, but unable to vape consistently, I used the ecig to REDUCE the number of analogs I smoked. THAT worked OK...but I was still smokin'.
It was only a few months ago that I realized the problem most likely was 100% PG juice that tasted like crapola. With better juice (30% or more VG to 100% VG), I've not had the sore tongue issue again, and I've made the switch completely to ecigs...FINALLY.
Although I really like 100% VG, I seem to be doing fine with as low as 30%. Don't know if that could be what you're experiencing, but I wanted to put it out there anyway.
Hope you find the solution soon, but I'm confident you'll find a solution eventually. Hang in there.