That sucks. Bad news comes in 3s right? So first your son was in the hosiptal, then you had to pull out of the race, and then the local trail closed. You're done, only good things from here on out.
I get angry/disappointed/fustrated when I miss things because of the kids too, but what can you do. The IVs are absolutely the worst part of having a child in the hospital, they had to try three times to get one in my son last year. It was awful, I couldn't bring myself to ride, I wanted to stay within cell range, so I went for lots of long runs. It helped to relieve the stress, produce some endorphines and hey extra cardio for those big climbs. I also did extra yoga (core strength for long hours on the bike).
I hope things are looking up today!
"I think it has done more to emancipate women than anything else in the world. It gives women a feeling of freedom and self-reliance. I stand and rejoice every time I see a woman ride by on a wheel...the picture of free, untrammeled womanhood." Susan B Anthony