He thinks I can't see it
The look he has sometimes
But I catch it every time
It's sad. He seems sad
It is an odd expression
On his face, at least
Why does he look like that?
Why does he wait till I'm not looking?
Should I be worried?
I'll admit, he's scaring me
He's never raised his voice
He's breaking under this stress
He calms down a little
When I sit down next to him
Like I ease his whirring mind
I don't know what I can do
I'm not of much use at all
But I'll do whatever I can
He's my best and only friend
So of course I have to try
And I'll just hope I'm enough
For years I sat unused, and no medicine could help me. Yet, when a doctor came to me, I began to work again. What am I?