Happiness V Sadness

I say, I say - today I'm on an up up upper
Tomorrow I'm down
Today I'm all right and I'm proper
Tomorrow I'm why, why
Yesterday I was switched on
Today I'm turned off
Yesterday I was someone
Tomorrow I'm not
Happiness versus sadness
I'm like a yo-yo in a spin spin spin
Happiness versus sadness
I'm like a yo-yo on a string string string
Have you heard the one about me
I'm high and mighty
And then I'm knocked out
Whenever I'm Little Miss Smiley
Later I'm crying loud
Yesterday I was waving
Today I'm all drowned
One morning I cave in
Another I'll bounce back
Happiness versus sadness
I'm like a yo-yo in a spin spin spin
Happiness versus sadness
I'm like a yo-yo on a string string string
Doctor doctor she said to me
- knock knock
'I can see why you're here, dear
But I've got 20 minutes
To cure all your woes and your ills
Pop pills, head shrinks, quit drink
I can prescribe for you'
Can this 7.20 really beat my moods?