I hate to hear you are so stressed Heeven.
I would never, ever , picture you unhappy.
My only advice would be to use your vacation as a complete stress break.
Dont think about your job
Dont think about your stress
Just enjoy your family and calm down for a while.
As soon as you get back, start stacking the pros and cons up.
Browse the market for another job that fits your experience and see if it would be worth it, even if it is a lateral movement instead of a progressive movement, to leave where you are.
Take some time like Jespah said, and try to see if you can get an assistant.
But, if possible, put a time frame on it.
Say - Over 2 months I am going to work on getting that assistant.
If after one month of that 2 month time it is starting to be obvious that you are not getting that assistant, spend the other month browsing jobs.
2 months goes by, nothing changes, start moving into another job with another company.
Maybe, putting a time frame on the possible solutions, MIGHT help reduce the immediate stress as you will know that it can be over in ___blah blah__ time..
I hope my rambling made sence..
Im still trying to finish my coffee and I get de-railed quickly.
( big hug)