Leaving aside the rights and wrongs of the current Twitter "spat" between Mo Farah and Andy Vernon ( and I think AV's initial remark was pretty innocuous and Mo shouldn't have reacted as he did) I was struck by reading that Andy Vernon only earned approximately 20 - 25K from his athletics career in 2014.
Considering he is the 2nd best distance runner in the country (possibly in Europe) this is a paltry reward for the raw talent and commitment needed to reach such a high standard.
I imagine it's not much different in some other individual sports (the earnings gap between Andy Murray and the other male tennis pros must be huge), but athletics is now a professional sport and this isn't exactly encouraging for exceptionally talented young athletes who are maybe hoping to make a career out of running. It seems you've got to reach Olympic/World Championship medal standard to earn a reasonable living (in what is likely to be a very short career at the top).
Thanks to all for your replies. Runloz - I hope you are able to get back running very soon; your story puts my (hopefully) temporary "downtime" into perspective.
The message is very clear - come back slowly and be very patient. I've also been looking for advice on the internet and the "Livestrong" website recommends a week of 20 - 30 minute walking followed by (assuming no adverse reaction) starting to run slowly for 25% of your pre-illness times (i.e. if you usually ran for an hour steady, start at 15 minutes).
At first, I thought that sounded unnecessarily cautious, but I think the danger of pushing too hard too soon is such that it's better to proceed too slowly rather than risk a relapse.
I'm planning a 30 minute walk tomorrow and I'll take it from there.