Hello MissTerious I have been reading your health problem and feel I must try and help you, as I had the same high anxiety, coupled with agrophobia and panic attacks several years ago.
It all started as I was under severe stress through what was then happening with family life.
I am now a much much calmer person, having taking a few simple steps and really hope that some of these may help you. None of them will do any harm and if at least one of them helps I will be happy for you :).
Firstly you have to learn how to relax. Sit quietly in a comfy chair, feet on the floor. Close your eyes, drop your shoulders while breathing out. Breathe in, count to 7 then slowly breathe out counting to 8. Repeat several times.
Place your right hand on your left shoulder and slowly stroke your hand down your arm while thinking of walking on a beach in the warm sun. Then place left hand on right shoulder and do the same.
Repeat several times, remembering to do the deep slow breathing.
I aso do Tai Chi while sitting down, just with my arm movements.
A cube of crystalized stem ginger slowly sucked calms my nerves.
Keep hydrated with water (I like chilled water which slows the pulse rate and helps me)
My diet helps too as I am type 2 diabetic and limit certain foods.
I am on low dose of warfarin, enalapril for BP and statin in the evening.
I really hope some of this will help you to relax. x