Hi Julia, before my injury I always exercised a lot so wanted to stay fit if at all possible. I gradually built up my walking distance, but pushed it a couple of times and felt exhausted afterwards. One early time I had trouble getting back and had to sit down for a hour. The next two days I rested and recovered and felt stronger. afterwards. Another time, about 6 months in, I tried to jog and got a sharp pain in the front of my head so I stopped that right away, now I can jog without pain.

I think it's understanding where your limits are and the triggers to feeling bad that is difficult. Degrees of brain fatigue is hard to judge, but pushing a little every so often worked for me.