Fear of Leaving comfort zone & What Ifs.

Currently I am facing high anxiety levels and panic while traveling out of my state and to unknown places. The fear of not getting any help and the fear of losing control often occupy my mind. The 'what ifs' bother me a lot and the fear of having a panic attack leads me to not go far away from my state. My current safe zone has become my state. I want to travel the world and pretty determined of doing so sooner or later. I challenge my self every other day to face my fear and leave my comfort zone. I have traveled successfully this year but with enhanced anxiety levels. I am currently on 12.5mg CR paroxetine(anxiety) and 0.5 mg clonazepam (SOS) for trouble sleeping. I am on these medicines since 2015 October. Prior to this, I was having paroxetine 25mg (from 2013 end till September 2015). The fear of what ifs and fear of leaving my safe zone has gradually developed since I have switched from 25mg to 12.5mg. Is it a withdrawal symptom ? How do i ultimately deal with it. Plz help.