I always feel extra sensitive about a week and a half before my menstrual period begins. During that time I dilate less and that is okay. It won’t cause a major set back, and if it does you can always start small and work your way up. I also find that when i feel that burning sensation I do the kegal exercises as I am slowly inserting the dilator. That was a suggestion of Dr. Pacik and it really does help alot. If you clench your muscles and then slowly push in the dilator as you release you can feel it ease in with less discomfort. After a while the burning sensation lessens and it goes away.