Claire regarding the food and milk how much do you really need to take on board with you for such a short flight? If you could cut that back to bare minimum it'll take some pressure off you.
Can you give the airline a ring before you go and ask if there'll be any help available? If you explain you're travelling alone and need the buggy asap because of your back they may be helpful.
If they aren't there's always other mums who have been through struggling before and usually help. Or do as I used to do when visiting my grandad, struggling to get off a bus with Andrew, buggy, bags etc. I'd stand up and loudly ask are there any gentlemen on this bus who could help me? It usually shames strong men who would have watched you struggle into helping
