What is the most painful thing you have gone through in parenthood?

the most painful part is when my kids got fever..When my 2nd girl 1yrs old we have been in and out of hospital due to fit.My late brother got the sick since young and gosh since my kids gets it i was so stress and even nearly goes to depression.At that time my hubby pay was only $700..Now i am please as i know what i suppose to do before it gets worse..