Regardless, you need an employee.
You would be amazed at how better you will feel spreading out some of the labor with someone else.
Was having the beginnings of major back issues until I finally got to the point of hiring a couple of guys. One full time and one part time when needed.
Yes, I still have back issues, but it has diminished immensely. Not as much pain overall and I've only had one or two spells of back spasms this year compared to almost constantly before.
It has also helped me to focus on the office and clerical work more, thus bringing in more work, thus helping to pay said employees.