I know re the spreading of the swelling, I can't believe my leg went from redness and soreness/swelling near the bites to my whole bloomin' lower leg swollen up like a balloon. That's why the triage nurse kept me at A&E, as she wasn't sure if I would need IV medication. I didn't thankfully.
You sound positive Cathode, which is lovely. I know what you mean about feeling like coming out of some form of tunnel almost as the DC get older. Suddenly, you can hold a conversation again and actually get to the end, rather than being interrupted.
Re recovery, I've read quite a lot in the past about mind over matter, but I'm no expert, really I am not, apart from feeling a bit of that at mile 24 of a marathon
. These guys who run 300 marathons in 300 days for charity or complete amazing feats of endurance and bravery for the hell of it, they don't think 'better not today, got a sniffle'. I guess I think it's easy to tell yourself you can't but much harder to say 'I can'. My own DH is bi-polar as you know, but he has always said the day he gives in and doesn't get out of bed will be the day it defeats him (it did his DF). And there have been days when I have had to physically drag him out of bed, when he's cried and shouted and shivered in a corner. But he's made me promise to do it, always. And he inspires me for it.
BUT, I don't always listen properly to my body and I'm a stubborn cowbag, so I'm sure there's a balance to find which is right for each of us individually, which we all have to find ourselves. 
If I'm running and feeling like giving up, I figure Mo Farah wouldn't lol. How sad is that? 
And that was probably waffle, so feel free to ignore!