"You are not working from home; you are at your home during a crisis trying to work."
Not that it helps much, but you have my sympathy. If it feels like it's really, really hard, stressful, and frustrating it's because it is. And that's okay.
It's really an unreasonable and unhealthy amount of work for 2 people. We split the day into AM/PM shifts, we both have to help during each others shifts, and I need to help out when she's pumping. I normally cook all of our food, anyway, but with all of this additional overhead it's really wearing me the hell out. We pick work back up after we finish getting the twins to bed and eat dinner. I feel like I'm a walking corpse half of every day.
My only unsolicited advice (because unsolicited advice is obligatory on the internet) is to cut yourselves a whole lot of slack. A lot of stuff we worry about as parents means very little in the grand scheme of things. Don't add any extra stress you don't need. Take any and all "shortcuts".
I have a 3 year old and a 3 month old. My wife does not work (quit her retail job to have our second) so my situation is different. That being said, making sure everyone is eating and sleeping as much/well as possible takes everything we have.