Recently there's two cases of suicide from a famous company in China.
Nowadays white collars are bearing high work pressures, they live a simple and hard work life, OT is usual thing, most of their time are occupied by work, especially those engineers work on real time or criticle stuffs, a small mistake can cause a big bad result, they always stay in high alert status, which is easy to drive one crazy.
If you're feeling so for a very long time, I suggest you to take a break, or change the job, have time to treat yourself well. And, take care of your family members who are working in such status.
Life is short, enjoy.