Na minha cabeça

In my head

I can be the light or the darkness. I'm a switch, on or off as you wish.
I'm almost two centuries old, but I'm still in good health and efficient.
There are many types of switches, and they live everywhere.
There are rocker switches, push-button switches, automatic switches, chandelier switches and staircase switches.
The most common ones are on walls and electrical appliances, but I'm referring to a much older one that lives in our heads and is as old as humanity.
They switch the ‘complicometer’ on and off, they switch positive thinking on and off, they switch creativity on and off, they switch intelligence on and off, they just switch it on and off.
We live together and always together, but we always find it very difficult to know how and when to switch on and off.
Sometimes we spoil everything because we don't switch on or off.
More and more we need outside help, but often we undervalue it, we don't ask for help or we're not aware and we let it go.
I'm looking for someone, a psychologist or a psychiatrist who can help me 
See you soon! I really need a switch.