Getting sick: oh yes, ds is acting pretty 'normal' before coming up with a cold or other acute illness. The hyper is usually gone for 1-2 days and you wonder what you've been thinking that he's always so active and a hands full etc., and then on day 3: fever! All right now I get it :-).
It's happened several times like this, I even had other people who saw my son in (for us 'low') action on such days, that my 'ds1 seemed to be much more hyperactive/busy than my ds2' (and usually it's the other way around, or at least equally wild) and I remember me replying: well, actually, no he ISN'T AT ALL but now you mention it, today indeed he's much less energetic, I wonder how come.
Dinner time/food: Our PREFERENCE as a family is to sit down together for mealtimes, because it is cosy and family connection time, a break for all etc. But it is not a RULE. Tbh, with ds2 I am already happy if he ate some decent foods during the day. He's also a snacker, from early age on very independent on food choice by himself out of the cupboards/fridge, he chooses his own foods, acc. to his liking only etc., I'm fine with that, even if I wasn't completely (he was always into things lol and at 2 that can be pretty messy or even dangerous) I had to BE fine with it because it's just him. MAKING him do things is asking for hell, lol. I can STRONGLY SUGGEST but if he has other plans, that's that and we are or try to be fine with that.
Need to check out your thread. Sorry you didn't find much support, but I sure know what you mean so you got mine!