As a veteran of arthritis, and physio advice, I think you need to ask "why" in more detail. Can he see the physio again? Ask how long before you would expect to see a difference, it will only be an estimate, but should help with goals. What is too difficult? Finding the time or space, or the exercises themselves? And if they are too difficult, what can be done?
I am very badly co-ordinated, with very poor proprioception. Good physios are used to being patient with someone like me. My physio watches me, corrects me manually, and understands that it takes me a good many goes to " get it".
It is also possible that being unable to do the exercises properly is a symptom of whatever is the problem.
So I would go back to the physio and accept "baby steps". This can be very hard, I have broken down at feeling "so stupid". I remind myself that I can easily do stuff that others find hard, and with this skill I need more help than the average.
If the physio isn't sympathetic, find another one! Good luck