Do you want to be working in this trade this time next year? if so, invest in your career by investing in yourself.
You cannot be doing this to yourself, its not on. You are going to ruin yourself for future work.
It is not fair that you are doing all of this alone, you must speak up.
i would also get booked onto a hands-free or advanced massage course as quickly as possible, or a good lomi lomi massage course. On these courses you should be taught how to use your forearms and elbows to massage with.
I do a lot of massage, its my main therapy, but the most i do is 6 and thats not every day.
Once I got booked to do an office block, I did 12 Indian head massages one day and 13 the next. I was then off work for 2 weeks whilst my hands recovered. Was it worth it, hell no. Would I do it again, hell no.
I once went to the GP and explained that my hands/wrists throbbed, he prescribed me high doses of ibuprofen for a short space of time to get the inflammation down and told me to LISTEN TO MY BODY. If it tells me I'm tired LISTEN AND REACT.
Good luck with talking to your boss, its not easy but you will not be able to do this for much longer and think of the irreplable damage you are causing yourself.
a full time therapist has a 7 year shelf life..........I've been doing this 18 years but NOT on a full time basis. with being self employed, if i have a busy day, I make sure the next day is quieter.
If you are in pain after being at work then that is not an ideal situation, act on it now before its irreversable.