I've been in this situation in the past. One way I've found very useful to deal with it is to have a project outside of work. It can be anything from a hobby to your own startup. Ironically, having a side project made me more effective at work. Since my ego was no longer tied to the success or failure of the company, I found that I could do what I needed to do at work well, while not getting agitated by happenings outside of my control.
The technique worked so well, that I've continued doing it even after the situation resolved itself. To date, I still keep a strict boundary time for when to stop work and switch to the side project every day. I spend about 4hrs of my day on the side project and about 8-10 hours on professional work. I find myself being really productive and yet not getting exhausted by what would otherwise be grinding 14-hour days.
And once a year I take an entire month off, and leave my work phone/computer at home while I go on vacation.
The technique worked so well, that I've continued doing it even after the situation resolved itself. To date, I still keep a strict boundary time for when to stop work and switch to the side project every day. I spend about 4hrs of my day on the side project and about 8-10 hours on professional work. I find myself being really productive and yet not getting exhausted by what would otherwise be grinding 14-hour days.
And once a year I take an entire month off, and leave my work phone/computer at home while I go on vacation.