I refined my initial comment a little to not to sound so depressing. I do enjoy my work itself but the pursuit of success is not enjoyable when you don't get any meaningful results - Especially when the whole system feels like it is stacked against you.

I did change countries recently - I'm working remotely but it's definitely not a break.

Hey, I've definitely felt that way before, and know a few friends that spent a good deal of time there. Sometimes you can spend so much time in a paper bag you forget that it's a paper bag you could punch your way out of any time you want. If it's not too personal, how is it that you feel that the system is stacked against you?

This can be good advice for some. It might not be choice for someone with depression. Deeper problems are not solved by a vacation.

This is not a bad suggestion. Sometimes your sanity requires taking a break. We forget the world/company/team doesn't stop without "us". Being in a different environment really helps. I've done a weekend trip to Disney and a longer trip to Hawaii. Both were done with little planning and really helped me out.

Going to throw a visible +1 into the ring here.

The only way over burnout is to put some distance between yourself and work.

Also, it's incredibly hard to self-evaluate your output when you're overworked and stressed. You may think you're making forward progress but you're usually harming the project and yourself more.