Simon Kirk Sørensen
Don't be to harsh on your self. I firmly believe that our help is not worth much if we don't have energy to spare, and it sounds like you needed to tend to yourself a bit before worrying about others.
Put yourself first and make sure you are well balanced and full of energy, and then I'm sure you have the ability to do something about it next time. Remember this: You cannot give others the help you need yourself.
That is about the first rule before helping some in trouble:
1. make sure you are safe
2. make sure victim is safe
3. order someone to get professional help (and have him/her report back)
4. attend to victim
or something along those lines anyway