I would like to say I used to do something similar except it wasn't my breathing but my heartbeat. I still on occasion fall into the compulsion to check my blood pressure, check my heart rate repeatedly. I mean I was adamant about finding something wrong, funky blood pressure, tachycardia, and for quite a while I sported a nice bruise around my upper arm from using the BP cuff in excess of 5 times an hour every waking moment.
The body is an amazing thing; just like your computer it has all these super neat background processes you are not made aware of usually. Your brain is firing like spark plugs, your digestive system is doing the worm, sucking out stuff it metabolizes to recharge your energy. Your immune system is re enacting the battle of the bulge, defending your body against all manner of nasty creepy crawlies, and your heart is the dj of your soul, busting out some funky fresh beats as it moves your blood around to all the places it needs to go and back home again.
A body that amazing and alive can easily handle autonomic breathing without you trying to control it somatically. Your lungs will keep doing lung stuff even while you aren't looking.
Trusting people, yourself, your body, your mind, the world around you is perhaps one of the Achilles ' heels of the anxiety monster. So let's slay that asshole in the foot, you and me, and the rest of us spazz masters.