Hi there
I know exactly how you feel. I used to get mine when driving at night (think the trigger was being first on an accident scene one night). Every night I'd drive home and I'd start to get tingles in my fingers, then sometimes end up with palpatations and even paralysis!
Dr told me I was hyperventilating, thought it was bull but it was from shallow breathing cos I was so anxious about the drive home. Still not comfortable at big dos or crowded places/having people behind me/in a supermarket queue, but thankfully not had a full on attack for 10 years now. I used to always plan my escape route, or make excuses not to go places.
I found it became psychosematic, I was having panic attacks cos I was worried about having panic attacks! Eventually with becoming aware of my breathing (at first I couldn't breath naturally cos I was monitoring it all the time!) and with time doing it's healing bit, I worried less with each successful drive at night. I've had them elsewhere but nothing like the driving ones!
Also negative thinking wasn't helping, so I got a book on self-hypnosis and managed to do it and replace bad thoughts with good ones!
Dr gave me beta blockers as they stop the adrenalin which kicks off the palpatations, but I only use them if I know of a tricky situation coming up, such as a speech/presentation.
So I'd say become aware of your breathing but not obsessed by it, if you feel anxiety coming on, take a slow deep breath and hold it for a bit, exhale slowly, and repeat a couple of times.
Bad posture may be making you breath more shallow.
If you can pinpoint a particular thing that is making you anxious then maybe the psychotherapy or hypnosis would help.
By the way, you don't stick out as much as you think you do when you are having an attack!
Also people won't understand unless they've had them too.
Try not to go on a negative train of thought of what if I get an attack