Above, mikeinarvada mentioned slow, deep breathing. He is quite correct and I wish to add a name and process that might help.
I am not a doctor or any sort of medical professional. Retired engineer.
There is a technique called “4-7-8 breathing” that is useful for relaxing and lowering BP and anxiety. You can google it but basically it involves slowly inhaling through your nose - inflating your abdomen rather than chest (diaphragm breathing) for a count of four. Hold that breath for a count of seven, then let it out through your mouth (some say - with your tongue tip behind your eye-teeth) for a count of 8 - without forcing, just allowing it to escape.
If you do this 2, 3, 4 times (not to get light-headed) you will find your anxiety flowing out with the breath you are releasing. It sounds corny, silly, stupid, and crazy - but it works.
My hearing is poor enough that I avoid interpersonal interaction as much as possible. Many people speak too rapidly, fail to enunciate, do not face the person to whom they are speaking (no lip reading) and generally are too difficult to understand for the effort to be worthwhile. When forced by circumstances to interact with them, I do a lot of 4-7-8 breathing and it saves me no end of heartache and anxiety.
If you watched a TV show called Saturday Night Live in the '60s, you may recall a skit in which the interpreter for hard-of-hearing people did not sign, he simply shouted - repeating what had been said at a ridiculously high volume as if speaking louder was what was required. If you can laugh, you can survive.
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I am probably reading too much between the lines, but I stand corrected… As always 
