I can't tell you where a poem comes from, what it is, or what it is for: nor can any other man. The reason I can't tell you is that the purpose of a poem is to go past telling, to be recognised by burning.
I think maybe when you live with someone who is really very ill for a long time, it somehow gives you more of a greedy appetite for life and maybe, yes, you are less measured in your behaviour than you would otherwise be.