In my experience, each of us has to identify the signs of overdoing it. It can be needing to reread a line of text or struggling to focus or not understanding what has been spoken. There are a myriad of other signs that we need to figure out. Some over-efforts or over-stimulations do not manifest until the next day. We have to dig deep to accept the need to moderate these efforts and exposures.

Only you know what is going on in your daily life.

What kind of activities do you mean when you say you can only do 'low stress activities' for 5 minutes ?