* For work satisfaction/acceptance, read through IliniDave's post. He seems to have the best handle on not letting the job get to you.
* For sleeping better, eliminate all coffee and alcohol. This could be hard if this is currently being used to "adjust" to the job. Also, increase time between eating and sleeping (don't eat right before bed.) 80% of the effects of eliminating coffee should happen within a week. The last 19% with a month. If you had to pick one to eliminate for better sleep, pick the caffeine. (There's a bunch of coffee threads on the forum)
* Sleeping meds are addictive and the body adapts to doses. That might be why you couldn't get them.
* Messes and pile-ups can be dealt with by simplifying. If there's no stuff to generate a mess, the mess can't be a constant reminder. IOW, one bowl, one pot, one spoon, and one cup doesn't make for a pile of dishes. Full disclaimer: My first symptom of stress is an acute need to downsize my stuff. It usually helps. It even solves part of the problem unlike when students develop acute needs to bake and clean whenever an exam is coming up

* Exercise provides temporary relief for immediate stress. As long as it's not "dreadful exercise", e.g. pick some fun stuff like pick-up basketball. Not a 100 burpees-for-time drill. The exercise needs to be sufficiently mentally challenging to complete take your mind off the stress factor. The worst choice in that regard is swimming or running.
* Changing venue does provide temporary relief, but it doesn't solve the problem if the problem is not the site or the people you work with. If the problem is you (whereever you go), your vocation, your career, ... expect increasingly less from this strategy. I did use this strategy to figure out "what" the problem was. Turns out it was the career for me.
PS: Yes, I quit my job a couple of months ago.