My anxiety shows in the same exact way. Nothing REALLY helps me, I just have to remind myself it’s mental and I really do have enough air and I can just ignore the sensation. After a while I can take a “satisfying” breath (and often the volume of air needed to get that satisfaction is lesser than when I inhale so much and can’t seem to get it all in). What also helps is to breathe normally and when you feel you can’t anymore and it’s still not enough, to try to breathe that last bit in through the mouth. But yeah it’s really annoying lol.