Dry skin and lips? I'm turning into an alligator!?

I drink alot of water but my lips remain permanently chapped/split. I think I might have *severe* dry skin. Even when I used to put moisterizer on nothing helped (I am also allergic to shea er). My skin cracks on my feet and hands and stretch marks become actual painful cuts into my skin. I have even gone down to using no soap at all in the shower and baby shampoo because everything seems to make it worst. What can I use to make it better?!