Now wfh I have started lurking around the forum again and I found this thread quite helpful when I got ill last month. Thought i'd throw in my experience for reference.
I am 6 years post heart transplant, so in the extremely vulnerable group, and have been fully isolating since 18 March other than an hour walk at 6am on land I manage. Having said that I have a physical job, ride my bullet over 2 cotswold valleys each day to work with the dog on board, train 4 nights a week, and am back to racing bikes.
I got weird unexplained blisters over easter weekend. Following 2 weeks i got a strange rash, my lungs started to not be as efficient, DOM's and training indoors became tough. Did routine FTP test, failed hard, next morning I was in bed for 4 days. Subsequent week was pretty shit. Took just over 2 weeks of nothing - literally netflix and bed before I felt well enough to even do a super gentle dog walk. 3 weeks later and I'm doing OK now. Back to training but easing in slow. I lost 2.5kg of muscle in the time I was ill - i'm on immune suppression and getting properly ill is irregular but always results in muscle loss, but normally this much.
Take away points having spoken to GP, 111, transplant team, and the guy running the local CV ward: Testing is really unreliable and one of the best thing to do is keep an eye on your oxygen saturation levels. I use an oxymeter because i check my states daily but you can get them as phone apps now too. Basis is that CV pneumonia is death of cells in the lungs so if you've got a bad cough (which counts as mild symptoms) you can gauge when your lungs start to actually deteriorate and act. This article explains it better than me: https://www.nytimes.com/2020/04/20/opinion/sunday/coronavirus-testing-pneumonia.html
Anyway, I found the thread useful when I was trying to work out if I did have it an trying to work out how long it might last so thought I'd add to the story.
In the end a friend of ours who had been doing our shopping for us got quite ill with it and she delivered during the time she was contagious but not symptomatic so we expect we probably didn't clean something well enough. I was never tested in the end as I didn't meet criteria and all medical professionals thought it wasn't worth running the risk of getting it from a test centre if I didn't have it, so we'll never know. I was lucky, hope everyone else who gets it is too.