Yes, breathing exercises, yoga, meditation all have a calming effect.
It might help you to remeber that anxiety is a false threat created by mind.
Our thoughts do become feelings.
Anxiety is the bodies reaction of fight or flight spurred by unrealistic thought processes.
You are safe in your bed, no threat to your well being, no wolves at the door so to speak..BUT…your mind creates the body sensation response of threat, only it is all in your imagination.
I only experenced anxiety attacks once during a divorce some years ago, it was not a pleasant feeling.
Fortunetly I have not had chronic issues with this.
I’d also reccommend some soothing music or ‘spiritual’ works on cd, such as Eckhart Tolle as a reminder of how your thoughts can be managed for optimum well being.
I also highly recommend hypnosis and learning self hypnosis techniques.
A certified medical hypnotherapist can do amazing things for you.
I just completed a 7 week program for self improvement, creative resourcing and to maintain abstinence from an on again/off again smoking habit.
I feel GREAT!
Best to you! :-)