This is a picture of a nerve which runs through our body and into the brain. When we have a lot of neurons linking different parts of our brain then there is an interaction between those parts. If there is a sudden shock in childhood, then we will build a response to become wary of the situations that are similar to that.
Anxiety, relationship issues, depression and fears all stem from habits of thinking and can be changed by changing the neuropathways in the brain. You do not need drugs to change your mood, you can do this with rTMShypnotherapy developed by Carolyn Clark, with Integral Counselling.