Extremely dry lips NOTHING has worked

I have extremely dry and chapped lips. I didn't used to have this problem. I've tried to drink more water, and I've used pretty much every popular lip product on the market. I can't use things that contain lanolin because I'm allergic which sucks because it's in so many popular products like aquaphor. I've used pure shea butter, lip masks, lip balm, petroleum based products and nothing has worked. At this point I'm willing to spend whatever it takes to solve this issue because it really effects my self esteem. So any and all advice is welcomed.