That's the point my friend. real RPG's test your ability to survive. Once you get around lvl 7 and 8, you can stay out with no recovery left and no pots. I do it comfortably all the time. Just save a lot. Why should your hp regenerate? That's what adds to the challenge, you must think before you act to survive

.
Once you figure it out, you'll see. I felt the same way at first and I'm now glad I don't regenerate.
If you need help just holler in the general forum and we will be happy to give advice.