This sounds quite lonely, but on the flip side he sounds like an incredible father, and hard worker, on top of his busy work schedule. And, what a strong, amazing mother too!
My father worked away for months at a time, and it was hard for all of us being away from him, but I was fortunate to never lack for anything, which so many others did. My exh also travelled away for work, but we didn’t have dc. I had come to enjoy my alone time & kept busy, but knew ahead that when we had children, the reality would be me doing most of it. This is the case for my friends whose dh are doctors, or have jobs that take them abroad, or away for extended periods.
My mother didn’t have a job, bar the ft job of looking after us, running the house etc. Many of her friend’s husbands/family members were in the same line of work, and that’s just how it was… The women built a strong social life, did the child rearing, and weren’t in employment - different times. Would you consider cutting down your hours or going PT? From others in similar situations, it seems the way to go. As for the comms, you need to talk about it together to see what’s possible.
Could you make friends with some doctor’s wives? What about this situation is within your control?
Personally, I would get additional help like a cleaner, and childcare & cut down my hours, or take a career break for a while whilst the DC are young. Perhaps minimise the amount of time you spend cooking/cleaning by prepping or batch cooking so that it feels a bit easier in the evenings.
Make sure you’ve got some holidays, dates & 1:1 time planned that you can look forward to.
Pragmatically speaking, if you split up, you’ll be in the same boat, unless you get a new partner, but I imagine the majority of the childcare would be with you still.