I am currently in the stage of slow progress and have learnt that pushing beyond limits makes things worse. I have also read warnings about not restarting things when a little progress has been made.
I have resolved myself to allowing enough time to recover before returning to work. However work have now started regular reviews. I have said this may take a while. Their policy is that more contact means people return sooner. I also don't think they get the difference between ordinary stress and autistic burnout.
I would be interested in other people's experiences.