I am so sorry!! If you want to talk please PM me. I am currently going though something similiar (my grandpa had 6 bypasses yesterday (his 2nd surgery of this type) and isn't have a good recovery).
I completely understand not being into work. I'm sure your work does as well. It's hard to concentrate when your mind is on other, more important, things. Don't feel bad about taking some time off to be with your dad. You won't regret it.
My thoughts are with you and your family, as I know this is a very difficult time.
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"Despite all your best intentions, sometimes, fate wins anyway."