Is this agoraphobia or am I a Highly Sensitive Person (HSP)? If I am HSP could this, through misunderstanding, have lead to anxiety and fear and created the phobia?
HSP is when you have an inherent high awareness of the external and internal. (NOT to be confused with any spiritual or metaphysical awareness). The over-stimulation leading to fear and anxiety, especially when you do not know what is going on and think something is wrong and your weak or not normal.
