I'm constantly working and never get a break. Its been getting to me lately and I'm grumpy all the time.
I feel you have you tried setting a schedule or is it from lack of rest.
I'm just working double time while work is busier and everyone has to put in the time. I definitely don't sleep as well because of it.
You may need a vacation or take a little break you don't want to overwork or wear your body down to much.