It's normal to have a lot of infections after getting cut in a battle? I had to endure three infections because of a fight I had with a looter.
The first time:
I put clean rags in the wounds (2, one in the right arm, and the other in head)
I drink 2-3 bottles of Bark Tea, make a safe place to sleep (sleeping bag + 2 noise traps + campfire).
I sleep a few hours, some times a enfield horror appears to wake me up, but I don't start a fight. I sleep more.

After getting thursty and drinking a lot of water, it seemed my problems were gone. I was wrong.

Second time:
I search in forest tiles, to get more twigs and bark to make more tea.
I drink some tea and use it in my wounds.
I eat medium chunk of meat.
Make a camp in another place. I rest.

I am healthy again, yaaay! Not for long.

And now I have to deal with a infection again, it's the third time. :(
I didn't get new injuries, I avoided fights, I am eating cooked meat, water (sterilized) and bark tea. And resting.
I need to go to DMC Clinic to get rid of this, or I'll have infinite infections until I die?

Did you wash the wounds before applying bandages? Clean water is good, bark tea or whisky is better. If the wounds are serious the infection chance of unwashed wounds is high even with clean bandages.

Oh yeah... I won't spoil it but there's certain places in the game that can make you SERIOUSLY ill, and even worse, remain a chronic condition that goes dormant and then keeps coming back. You'll know it when you see it.

I am going off topic, but this makes me wonder if there are ever happening any good things to you in this game?

It is a survival game. Every small victory is a good thing. Finding clothes before you freeze, clean water before you die of thirst, food before you starve...materials that you need to craft better gear...winning a dangerous fight (or avoiding a dangerous enemy). These are the good things that happen to you.

Avoiding the bad things...or surviving them...is part of the fun, in a Rogue-like game.

I absolutely get your point and thanks for pointing this out, because I never looked at it this way before. But I guess this is why Rogue-likes and I are not made for each other. I mean, even under harsh circumstances really good things can happen, which almost never is the case in games like this.

And I hate it when I move along, slowly and carefully, but then the game sneaks up from behind and smacks me over the head with a lead pipe. I am talking about events in the "and then a sniper hits you in the head from 2 miles away" sense. You know, things that one simply can not predict or influence. It is alright when the game tells me that I was not careful enough or forgot to take everything into consideration, but when you, for instance, did everything you could do and used every possibility the game gives you to create a safe shelter for the night... and THEN you get killed in your sleep, this is something that creates frustration for me.