Hello, everyone... I´m a 29 years old portuguese girl who´s looking for a job in Switzerland in the field of Psychology. I speak English and I`ve started to learn French... do you have any idea how can I find a job there?

Welcome to the Forum. In my opinion you need to be fluent in one of Switzerland's languages to be able to help your patients. I really do not think you will find a job without excellent French.

Unfortunately, I think you're right. I'm going to work hard on my French... thanks!

Be carefull though, "Psychologist" is a reglemented profession in Switzerland, which means that you need to get a special authorisation to start to work as a psychologist. You get the permission only if you have a specific diploma.
The cantons are responsible to deliver the authorisations to work.
Here is a link. :http://www.bbt.admin.ch/themen/01105/index.html?lang=fr

You could try the UK instead, I'd imagine it would be a better bet for you since you're fluent in English. What makes you choose Switzerland?