Stroke exhaustion - NOT amateur radio

It is perhaps surprising that well over 2 years since my stroke, I still get very exhausted so easily. We have had good old friends staying for a couple of nights and after helping to prepare lunch, I was totally exhausted. After 10-15 minutes I am OK again, but anything physical or mental gets me very tired after a short time. I guess I have to accept this is how it is going to be, although people tell me I am getting slowly better. They can see progress, although I cannot generally see it.