Hi Cinders, if you'd care to, try googling MTHFR677T. It's a genetic defect that is linked to many illnesses including chronic fatigue. I've been tested and along with an odd sense of humour and clumsiness, I've inherited it from both my parents which is worse case scenario. May be of use to you.
I've had my moments, but that is likely why I'm where I am now. I was feeling better after about a year so went straight back into marathon training. All was going well and long runs were back up to 20+ miles but gradually the problems returned. So exercise just dropped away over 3 or 4 months leaving me pretty much where I am now. I have occasional bouts of walking for perhaps a week or two but mostly just keeping up with work is enough.
Hence why I was pushing hard at you taking it easy - the body takes a while to recovery and I believe will still be repairing after you feel okay. Resting heartrate on waking is definitely important - don't do anything strenuous until that is normal and ideally for a few days. Really hope you sort this out, it gets more than a bit tedious after a while!
There are no guarantees but lots have come back from these kinds of problems. It might just be luck or the way people manage it during the early stages. But I think most important is to not push too soon, in fact don't push at all. Just take it very slowly. Mine hasn't been so good, came on in June 2010 and still causing problems but I've been very lucky as I haven't had it too rough. Just have to be realistic with activity. Look after yourself.
Oh, and when inevitably some wise one says you are just depressed, with depression, people don't want to exercise but when they do they feel better. With fatigue, you want to exercise but when you do, you feel ill.
Sorry to hear that Wescat - people do get over it but it can take time as Ultra Tri Chick says. You probably need to rest up as much as possible and don't do anything stressful mentally or physically as both take their toll. Think of your energy as limited, if you do too much today, the excess will come out of tomorrow's allowance so you'll have even less to work with. Make sure you get good quality sleep. Monitor your resting heartrate on waking - 5 or more above normal and you should take it easy. Also if you do go out for a walk keep your heartrate low, no more than 120bpm. As you feel better you'll eventually be able to start to increase that max, but very slowly.
Try to remain positive and find other things to do - if you brain is clear perhaps some reading. But be wary of concentrating too much, that'll come out of your energy reserves for the day too! Make sure you eat really healthily - your body will need all the help it can get.
Hope to hear you are on the mend soon. When you are though, just take things slowly, you'll almost certainly have the odd relapse but you'll want them to impact you as little as possible. Good luck and best wishes.