Yes I have had the same sensation some years ago while driving on a couple of occasions, I felt like I was on fire, it was winter and I had the ac on and windows down and it still wouldn't go away, it was also in my chest. Just the other night I was sitting here and my chest and face started burning so bad. I believe it is just yet another symptom of anxiety. I hope your meds will kick in again soon. Me on the other hand am afraid to start my meds and suffering from disabling anxiety at the moment, trembling all over, weird headed, anxious, all kinds of things. Wish you the best!