I personally found physio therapy harmful when done for ME/CFS itself.
I sought out a physio therapist on advice to safely strengthen myself after going from bedbound for 9mths to improving and being out of bed. Cause I hadnt been active at all for a long time (hadnt been able to walk at all much of the time), I was worried I'd do myself an injury so sought out what was supposively a safe physio (one who I was told had previous experience with a few previous ones who had ME/CFS or I would of never gone to one).
Anyway, instead of giving me a safe way to strengthen myself, her exercises which would of been no issues for a normal person going from bedbound to doing things again, proved very bad for me. With the very first exercise she had me do (which was like a half sit up), I hurt myself within the first few.. it felt like I'd actually torn a muscle in my abdomen so went into bad pain.
Second thing she did is she had me join a weekly physio therapy group where they did a little bit of gardening at the hospital (it was also a social thing for people where we all had lunch together after each physio session, it was thought a little bit of socialisation would be good for me too). I went once only as it made me much worst.
I went to the group able too use my hands and left that day unable to use my hands so was struggling to even drive home. At the end of the rehab session (which she had me sit on the ground and try to cut back a few little plants to my own limit) when it came time for then lunch, I couldnt even then eat properly with the fork. My hands had gone into severe spasming to the point my food was ending up with spasms being thrown all over the table. (the people sitting around me, I almost covered them with food).
It was soo embarrassing, I cant remember now, I may of started crying. I remember she had to comfort me but she had no idea at all it was her telling me to try to do some of that gardening which had caused me to end up not being able to use my hands. With my hands spasms and food going everywhere, she goes "dont worry, many at this table have problems".
Sadly due to me not being able to get a safe exercise program from her to slowly strengthen myself, I ended up injuring my back only weeks later (I was still very weak from having been bedridden and my back muscles were finding it hard to support myself well) and hence when picking up a small brick, I ended up in hospital for a week unable to move at all due to my back
(till aftter a near week in hospital, nurses tried to get me to get up to go to loo causing me to faint in back pain and crash to the floor unconscious which actually put my back back in otherwise who knows where I would be today with that, I'd hurt my back to the point I hadnt been able to bend it at all or twist it!).
...
and tai chi did me more harm then good, I was doing tai chi for a couple of years before I got ME/CFS and tried to continue it on getting sick. Then one day during one of these sessions, I suddenly developed a massive knot in my back which was then there for a very long time and painful in that place. I had to have then weekly massage sessions for almost a year (it may of been longer) to try to loosen and break the knot down.
So i strongly suggest that if you have canadian defined ME, to avoid physio for ME, a good outcome from this isnt likely. A suitable physio for us would have to be highly experienced with dealing with people with this (not someone who has just helped a few of us as things can too easily go wrong. I really did need physio after going from bedbound to being able to get out of bed again but simply no one out there with the right experience dealing with severe ME patients).