Catapedophobia
Tree Phobia
Such a person is usually called a 'coward'.
Because they are afraid of getting hurt.
No, this is your life. You can do what you want with it. Dont make someone think your someone else.
Paranoia.
I am only aware of a phobia concerning trees in general; it is called Dendrophobia.
When someone calls you "yellow", they are saying that you are afraid, craven, cowardly, etc.
Fear of travel: An irrational and unreasonable fear of travel is called agoraphobia.
the beastie
Some people are afraid of the sight of blood. This is called hemophobia. The symptoms listed in the question are all typical reactions when someone is afraid or panicking.
someone afraid of knees