Honey has high hp regen, but low stats and short duration.
Berries are a very low quality food with low stats, low hp regen, and short duration.

If you want better stats (hp, hp regen, stam), you need to eat better food. If you're eating sausage, you can make better than raw berries.

Make sure you are rested. The rested status improves your stamina regen, hp regen, and xp gain. You can raise the duration of your rested buff by improving the comfort rating of your base. (Focus on a bedroom.)

Conversely, the wet status will penalize your stamina regen and hp regen. Stay out of water, stay out of the rain, and hang out near fire if you are wet.

Take care in combat. You don't need to heal damage you don't take. If a swing or shot misses, that stamina was wasted. Eat good food, upgrade/update your gear, and remember to block.

Lastly, while you have the Resting status, your hp regen and stamina regen are greatly increased. If you're in bad shape and don't need or are unable to drink a healing potion, hang out in shelter with a fire and you'll recover quickly.