THIS Quote. I feel this way far too often.
Things that help me:
1. Hobbies. I took on coaching the high school's rock climbing team which has given me a healthy way to work out and relax. I try to go out on the long board with my dog at least every other day so that she gets exercise as well. Also I do a lot of camping in the summer and make sure to read books for pleasure.
2. Find someone you can vent to. Fortunately, my wife did a lot of theater in high school, so she can generally relate to my frustrations at work. I find that people with no theater background really don't understand the unique pressures that we operate under.
3. Ask for help. I have a huge problem letting go of control and handing projects over for someone else to complete, but sometimes you just can't do everything. It sounds to me like your workload has exceeded the realm of what can reasonably be expected of one employee. Can they hire a part timer? Can you get an intern? Can you get a senior with a volunteer period? Any local colleges with students needing tech practicum hours? Do you have Seniors that can run your crews?
4. Work to Live, don't Live to Work. Meaning, you go to work so that you can enjoy your life outside of work. This requires you do your best to have a life outside of work and 'leave it at the office'. Just the occasional
Sunday will not suffice. Make sure that when you leave the theater, you leave the stresses that it brings behind. This simple mind
shift really helps me when I find that the stress is getting to me.
I'm only in year four doing essentially the same thing as you so I should be asking you for tips, but this is how I cope. Something that helped me get out of a rut was that I acted in community theater over the summer. It was really nice to be the low-man and be able to just enjoy doing theater again. Try to remember what you love about it, and find ways to get away from it for a little while.