It seems that the family I mentioned wasted their time going to the hospital. You are more smart then the doctors!
I called them earlier: the kid was without fever for 24 hours and now it has fever again. Wife is feeling extremely dizzy but headache is a bit less. This infection is crazy. I simply cannot get it: there are some types of fever that are periodic (for example fever may come again one week after), but this thing IMO is chaotic.
As for vitamin C, it is useful
before you get sick-as a preventive measure. Afterwards it is too late, it won't help much. Anyway I like fruit and I ate kilos of mandarins the previous weeks. A similar amount of oranges was converted to orange juice for George. We have a mandarin tree in our garden but they are sour and small (maybe because it is surrounded by lemon trees?) with many seeds so I buy from the market. And when someone is sick with fever and doesn't have appetite orange juice helps maintain your electrolytes and provide you some energy by adding some sugar.