Old employers from 2015 have just asked me to come back 2 days a week. They were awesome employers, I know I could do the job well, they want my specific skills, at 20-ish hours a week close to home and school and DH's work, it would be the perfect part-time job; and it could potentially go for many years (1-year rolling contract as funding is awarded for it yearly). We live somewhere where jobs like this don't come up often and I've had great difficulty finding worthwhile work - or indeed any work at all.
However, DS (20 months) is a horrifically bad sleeper, I've been surviving on 30 minutes a couple of times a day, for most of his life. I am so tired I can't balance, can't drive, am barely able to function. I am not sure I can actually cope with working. DS absolutely hates noisy environments full of marauding kids (and 10 weeks of 2 playgroups and music classes overseas recently showed that he doesn't settle over time: he seems to hate the noise more, the longer we persevere). He is inclined to be very "sensitive", crying at the slightest shove or snatch from another kid... indeed crying at the slightest frustration and working himself into a lather to the point of vomiting pretty easily, if not comforted. He's probably chronically and acutely overtired (I know I am).
Everything screams at me that this is NOT the age to start him at nursery, when other kids the same age problem-solve by hitting, biting, snatching, shoving because they're frustrated and insufficiently verbal to negotiate properly. I can't find any childminders that are close enough that I actually like (have found a couple that I definitely don't like much). A nanny would mean I was paying about 100 quid a week to work. No family to help.
Turning this job down is the correct thing to do under these circumstances, yes?