[relaunched]

Personally, I'd say check the usual suspects first. Check your personal life first. Oftentimes, is something is out of whack in one place, it carries over to almost every other part of your life.

I think the most telling part about your story is "I'd say in the whole organisation there are only 2 people, plus myself, who actually care about writing good code". You either care about your job or you don't. It sounds like you do, but almost no one else in your organization does. That sucks. Do you say to yourself, "I hate my job, but love working with my co-workers?" If so, get out! It's hard and it's scary, but you need to. Trust me.

There are a lot of things you can do to care less about your job and find fulfillment elsewhere, but I advise against it. I want no part in turning someone into the kind of employee that doesn't really give a shit about what they do for a living.

Good Luck!