Only two? Come on! Take the whole pack!
You & your DH work such long hours! No wonder you're both exhausted. I don't know much about SPD, but my mum had it with my little sister & that was nothing to do with pushing herself too hard. It was just something rubbish that happened. Don't blame yourself.
As I said on your AIBU, as rubbish at this is, it is temporary - your children may not be able to have their mum running around in the park with them at the moment, but that will change. It will get better.
As for the getting sidelined, there's little that you can do, to be honest. Just remember that they can't obviously damage your career because you've got heaps of legal rights. I don't know how likely it is that you'll suffer professionally for this, but I'm sure that it seems worse at the moment because you're worried about everything else. & you're clearly very good at what you do & have been very successful, so I doubt that'll change now. Everybody will understand that you're too ill to do much.
Money is a complete pain in the bum, but there's nothing that anyone can say about that. Obviously it's a rubbish financial situation at the moment for everyone, but that too will get better. I hope the dentist isn't too awful.
& as for the looking a mess & smelling weird, you're certainly not the only one there.
Honestly, you'll be fine. It's just a really, really tough time at the moment, but you'll pull through it. & we're always here when you need us.