Shrink is the informal word you can use to talk about a therapist. Talking about your problems with her can hopefully help you shrink them, or make them smaller.
The word shrink is related to the Swedish skrynka meaning "to wrinkle." Think about what happens to a lone forgotten fruit at the bottom of your fridge drawer. After a while, it begins to wrinkle or shrink. Clothes washed in hot water tend to shrink, so be wary of the setting on your washing machine. The use of shrink as referring to therapists started as late as the 1960s — with the idea of a psychologist being a "head-shrinker."