I sympathize with you guys wanting to try everything and anything to find a complete cure, but so many posts lately make me just shake my head. There is an answer, and it's right before you.
Go to a doctor, get a prescription for a steroid CREAM (not ointment). Get a small thing of Aquaphor. These 2 things will last you for at least 6 months, and by then you won't even need the steroid. Apply a very light layer of the steroid cream to your lips, and lightly rub it in, the cream will absorb into your lips. Now apply a very light layer of Aquaphor, this is to create a barrier. Do this 2 times a day, morning, after brushing teeth, and night, after brushing teeth. It's very simple, easy, takes literally 30 seconds.
Now mostly importantly, ENJOY YOUR f***ING LIFE. Stop worrying about this condition all the time, stop going mad researching useless garbage. Eat what and how you want, drink how you want (f*** straws) brush your teeth normally, shower normally, it's OKAY to get your lips wet using this method. I've tried so many other methods, the leave it alone was horrible... annoying disgusting looking keratin build up on my lips, it was a worry every day, and when it eventually falls off it's only worse, you cannot fully heal with the leave it alone method. The LIGHT moisture method with a steroid is the way to go. You're healing, but MOST IMPORTANTLY you're enjoying your life and NOT WORRYING about your lips.
I can't even tell you how much better I feel not constantly worrying about my lips. The research and search for a miracle cure will drive you mad. You will become stressed and make it even worse, I wasn't showering properly (to avoid getting my lips wet) and ended up having a bad Acne
breakout, my teeth weren't being brushed properly, and on and on.
TL;DR Get a steroid CREAM, get Aquaphor, stop worrying, enjoy life, while healing.