Answer:
Charlie's therapist is using a technique known as CBT Cognitive Behavioral Therapy.
Explanation:
Cognitive Behavioral tecnique is often used to treat phobias, among other emotional or psychological afections. This tecnique is based on how negative emotionds and thoughts can be shaped into possitive ones, and so this can help deal with phobias or ansiety.
What Charlie's therapyst is doing is helping him relate his fear of hights with something nice and relaxing, that is how according to this tecnique people can overcome his fears by changing the idea of hights as a bad thing.
This tecnique works under the premise that behvior can be shifted with cognitive influence, this theory helps change thoughts that influence fear.
Depression can affect your health. People with depression tend to lose or exceed normal sleep, gain or lose weight. Being depressed around friends and family can cause a negative reaction from your friends and family, causing them to not want to be with you as often. Depression can affect mental health as well. If there is any other information you need, just comment. Hope this helped!
-TTL