I think you're doing great! Looks like this doctor knows what he is doing!
It is pretty acceptable that your lips aren't healing that fast, but if you do not have the white gunk anymore is the best part of the history
I'd say to you that I think is really important brushing teeth well right after every meal(in this way, the candida will not find any remains of food in your mouth)
I think the skin looks thin because it is dry, if you put some water and look to the mirror you can see that it will not look that thin(wrinkled)(for me looks like that)
You can wait about 30 minutes before you apply that cream. I think it will help too
I did 2 exams of my oral "gunk" and it showed nothing...