Oh dear.
Well, not having read everything already written I'll just add my few thoughts on the subject.
Mine has got this at the moment (OP - think we spoke elsewhere? anyway) and I have been trying to decide how to manage various things over the next, what, 4 or 5 days is it, before he's no longer contagious? Not much to contend with really is it, in the scheme of things.
Basically, I take him with me to places like certain shops, to school and wherever and he stays IN THE CAR. He can have the window a bit open if he likes but he stays in the car. All the time, and I try not to take too long, but he is 8 so he can manage reluctantly (he gets a bit worried on his own).
We're lucky to have the car or our lives would have been more difficult, getting his brother to school would have been tricky or running out of milk, etc etc. But it's not hard at all. It's fine.
I explained to him today how badly it can affect other people so we have to not be selfish. I think he understood eventually.
His brother had it first, two weeks ago and we did the same thing. He stayed in the car while I did a small amount of shopping, often with big brother there too to look after him. So it was alright. We coped and on day 8, which I think is well beyond infectiveness (?yes) we went out on a cycle ride, with his brother as well, to a park during school time.
Surprised to find two other children there - one a baby, at least 100 yards away from us (we parked up a fair bit away from anyone else) and the other a little girl with no hair, who looked about 5 or 6.
She was with her mum.
I told my boys to keep away from them as she was clearly having treatment for something serious. When she and her mother came towards us with a dog that had run off from somewhere, and they assumed was ours, (it wasn't), I kept the boys back and told the mum that one of them was getting over chicken pox and the other might possibly be contagious (he wasn't at that point, after all) and I said I understood it must be so hard for her.
She said it was and she really struggled to find places to take her daughter.
So anyway I felt bad for telling her in case it made her worried. And they left the park, a little while later, and then so did we, going the same way but passing them without stopping, we just said hi. I was so, so grateful that I knew my younger one was not contagious any longer, and no risk to her little girl, and that the older one had no real signs of being ill either.
I hope she was not worried. She probably was anyway 
The secretary at school told me, when I said I'd left ds in the car, that there were other children in the playground with the same illness and I said well, I'm not one of those people. They aren't allowed to say anything to the parents who bring in ill children...half his class went down with it at once the other week, probably due to someone being a bit inconsiderate.
Seriously, 5 days of isolation and missing a few school events is nothing.