Do I see a psychologist that deals only with cancer patients or any psychologist?

It's a really personal relationship. If you have a choice and a couple of options, take advantage of that. Other people's recommendations are useless as we all have different needs.

I don't know how helpful my psychologist really is, but I can dump shit on her that I wouldn't subject my friends to and do it without any guilt or feelings that what I say to her will come back and bite me on the arse later. Poor woman.