Don't waste your time with doctors man. What are they gonna do? How many people's lips improved after visiting a doctor or dermatologist?
I got ec the same way as you from biting my lips and it still pisses me off knowing that I'm the one who caused my life to become a living hell.
Since there's no universal cure, the best thing would be to find a good moisturizing cream that stops the crusts from growing and apply it regularly.
And please DON'T kill yourself. It's not worth it. I used to be just like you. I was always angry and depressed. I hated life and didn't care about anything but it never changed the situation. A negative mindset won't bring you a positive life. That's just the way it is. My lips are still f***ed up but it's bothering me less & less everyday.
Yeah I wish the people who healed their lips stayed on longer to help us out. I get annoyed when someone post their "cure" and then they just dissappear forever.