Especially when both dc are ill.
I find lone parenting extremely tough at the best of times. This afternoon I collected ds1 from school with a raging fever. He is currently asleep in a pool of sweat and I am worried. Within the last half an hour my very asthmatic ds2 has started what sounds like an asthma attack with a side of croup. 
It's so tough doing this alone. I am so tired from the day to day relentlessness of it all and now both my babies are poorly I feel I may just collapse.