wow I'm goooood!
Joking aside, it does sound like a Pandora's Box looming in the not-too-distant future.
My advice? Seriously consider your options in a realistic way soon. If you think it might be realistic to put in a flexible working request to reduce your hours to 3 days, one from home, start getting it together soon, I can help you. If you don't think that's realistic, start exploring more local options, even if you don't get the quality or level of work, you are probably more likely to get a good work/life balance and be nearer DS when he is in childcare as well, which is not to be underestimated. You could also consider whether there might be part time opportunities with other similar employers in the same location as your current job.
I am aware that I am 'telling you what to do' a bit more than I do with people normally, this is partly because I have huge empathy with your situation and also because I feel I have a bit more understanding of the realities of your situation than I usually do with people, plus I know you a bit better than others as well
If you start thinking about your options seriously soon, you may come to some decisions, and the relief of doing that will be great and will (hopefully) allow you to relax and enjoy the rest of your time off and be more motivated at the thought of going back to work than you currently are.
email address is flowery dot beanbag at ntlworld dot com if you want a chat.