Firstly let me say I finished treatment in October 2013 and I am only now feeling the waters with returning to work. YOU need to do what is right for you.
I have a suggestion regarding the library for you is it possible to get some volunteer mums/dads to help out for a bit ? just a thought.
Like you I struggle with more than one task at a time now but I have a wonderful company who are working with me at doing 2 days per month and building it from there.
Are you sleeping well or do you have the horrible insomnia that is common after our treatments. Are you still on Medications? I have gotten a Petrea King cd "Relaxation" it helps me to get to sleep and then sleep soundly. I feel more in control of life since I began having a good nights sleep.
Just a thought, take it easy on yourself life has changed.
xoxox Soldier Crab