Chasing we have a similar set up here with F - nursery 3 days, nanny 1 day and mix of dh/me/both the rest of the time. Add into that my wonky shift pattern, and you might expect chaos and confusion, but she has been fine. As others have said, O will love the socialising at nursery. Iirc he loves his playgroup? Nursery will be a glorified playgroup 
YW oh noooo! Suh unfortunate timing! Sods law says he'll be right as rain in the morning - hope this is the case.
Fatima that's how I feel often too. It is tough and horrible, and I hate myself for being crabby and snippy with dh, which doesn't help matters. And although you wish wish wish you could snap out of it, it somehow isn't that easy.
Good luck with your run Lily, even 3k is an achievement in my non-running eyes.
So after reducing the omeprazole we had a shitty shitty night where I saw every hr. She has spent the day hiccuping, coughing and randomly gagging, and has been stuck like a limpit to dh. Paediatricians can go fuck themselves, I am channeling my inner YW and saying, if the meds keep her happy and well, she is jolly well staying on them.