totally. Exercise is a good thing! Have you tried aqua jogging? If you have joint pain it may help? If exercising takes it's toil on your body, do one run as an aqua run once a week might help? it isn't as strenuous but still helps with training.
Lots of people do 10k's in well over an hour withiout any health issues - so I wouldn't worry!
Totally different illness to you, so may be completely different. I have a genetic disorder called HHT. Essentially it is an abnormal blood vessel thing that results in bleeds. it has various other symptoms such as anemia and fatigue. I have it very mild as far as I know. For me the main issue (currently) is fatigue.
I'm a bit of a lazy arse. So it's hard to know if i'm using fatigue as an excuse at times.
i try and set realistic goals.
helping to recognise the symptoms does help: makes me realise it is valid what I am feeling
eat and drink as well as possible
and sleep! Knowing that I have had a good nights sleep for 7+ hours helps me during the day as I tell myself: i am refreshed , I slept, I can do this run etc,