Sima,

It's good that you exercise. I couldn't help but notice that two of the types of exercise you do are ones that lots of people with CFS/ME can tolerate once they're in the "chronic" stage of the illness.

I don't know about the cycling. I used to several types of sports/exercise that made my heart rate go up high, and those are the ones that I can't tolerate anymore. It seems like as long as my heart rate doesn't go over about 130 while I'm exercising and I don't do too much, that I don't get the next day "crash".

I don't know how fast you cycle.

There are types of mitochondrial dysfunction that people can get. I don't know that much about it. Some people with CFS/ME have mitochondrial dysfunction and some people have mitochondrial dysfunction that is a different type of illness. You occasionally hear of former Olympic athletes being diagnosed with it.

I hope that you are able to find out what it is and get some help for it.