Flustered

I don't know why, but I have been feeling flustered these few days.
No mood to work. I even feel restless at home.

A colleague of mine recently pointed out that I hadn't taken a long break this year, compared to my previous years. Probably I need some time to relax and re-charge ?

At that time, I thought nothing of it, dismissed the idea. But today, I think I really need some time off.

Or am I just pressurizing myself too much, trying to do all that I set for myself to do within the next few months ?

Or am I just sick and tired of the environment here with some of my colleagues and bosses, that I just don't have the motivation to work anymore ?

Probably I still have to learn how to idle and not set too high expectations for myself.