I feel many of our fears in life are springing from the one main fear, fear of death. Coming to terms with death and how it is inevitable can remove many of the other related issues. An experiment that can really make you think is to actually use quite a bit of time on thinking about your own death. Visualise it, see yourself dying. Watch the process of stopping breathing and drifting into nothingness. Watch the arrangements for your funeral, see the family and their grief. Watch the procession to the graveyard and then the lowering into the ground of your coffin. Watch the years pass and the turning of the body back into the elements of the earth. If you do this and really accept that this process is inevitable then your hold on now becomes so much more precious.
Thinking about small irritations in the light of your imminent death reduces them to almost nothing, relationships you can never mend once you are dead become important again. We resist dealing with fear of death because it makes us anxious, by confronting it we actually reduce the anxiety strange as that may seem.
All the best in your recovery from anxiety...I have been there too.