Everything Under the Moon

Personally I would never give money to someone I'm not sure is the "real deal", or even at all for that matter. I can't imagine someone charging for services like that, but maybe that's just me. It's very easy to make blanket statements that appear to be specific to just you. I doubt you were the first person they told were "intuitive/sensitive" and you wont be the last. I think you should take everything they told you with a grain of salt. As for your ferret chewing on your shirt, animals are very attuned to our emotions. He/she could have been picking up on your emotions which could be the reason they were acting that way.

My advice would be to take a few deep breaths. Chances are if someone is charging you for spiritual guidance, they cant even communicate with spirit. Let alone open a door to anything.

Can people open the doorways to psychic or evil things?

Well it depends on your view. Becoming aware of something may seem like a door opening, and in some ways it is, but what it actually your awareness raising to those certain vibrations. Spiritual things happen all the time, but depending on your awareness will dictate on what you see or what you don't.