Herbs, you need to go off and do some navel gazing of your own for a few days, and leave your DP to take sole care of your DS. It's only fair, he had his few days, you need yours too, to take stock and contemplate your navel career. Make sure you go over a weekend, so that he has two full on days of the tedium of the park, Frozen, cooking, more park, some soft play, or something similar, where the DC are allegedly doing their own thing, but in reality, if you take your eyes off them, that is when they will fall over/twist their little ankle etc etc.
We reached crisis point when DH booked two work trips to the Middle East some years back, during my two busiest weeks of the year, and airily told me "you'll have to take leave, book a nanny or rearrange the meetings." (These meetings were booked in people's diaries over a year in advance to ensure attendance from Captains of Industry and Other Very Senior People. While I was a minor cog, I could not be replaced, due to the sensitivity of the issues discussed - had I been sick, my boss would have had to take on my role as well as hers.) Suffice it to say, words were said, his trips were rearranged and I asked him if he uttered the words "I understand that your career is at least as important as mine, and I will do anything possible to make your life easier", whether his cock and balls would shrivel and drop off as he said it. He can still be an arse, but said immediately that he would take DD to the hospital for her op on Monday so that I didn't need to take time off, and would stay with her until it had finished.
QQ - I have spent quite a lot of time working on crisis management and dealing with distressed people - eg people whose kids have been in a car crash and have horrific injuries, wives whose husbands have been shot dead, and am generally calm in a crisis. I'm also reasonably good at calming people down quickly, and getting them to focus on what can be done next, rather than dwelling on what has happened and why - such as making sure that the child is getting the best treatment possible in the hospital, and looking into the options of getting them out and somewhere else if that would be better, making sure a body goes into cold storage, taking a quick decision on whether the next of kin can view it (shot in the face at point blank range, best not to) and focusing on the practicalities of getting it back home. I've managed to calm very angry parents down, have been very sympathetic, sorted everything out for them, found out things I didn't know and relayed messages, and have turned them from hostile and snarling at me to grateful and back to reasonably normal in the space of half an hour. So with DD1, it was, OK, you have cut your hand badly. Put pressure on it, hold it up above your head to slow the bleeding and we will take you to A & E. You are not going to bleed to death and the hospital will sort it out. Screaming won't help, will probably raise your blood pressure and make you bleed more.