try to take deep deep breath ,take it widely deep long breath from your nose slowly and give it slowly from your mouth that will calm you and stabilize your heart beats and thus protect from breathlessness ,close your eyes ,listen to music ,go out or open window for pure air flow and take this deep breath you will be ok and fine .these also might help to protect from stress :
-Spend time in nature.
-Call a good friend and tell your problems
-Sweat out tension with a good workout and exercise ,you will put your energy in exercise rather in your body to prevent symptoms of stress
-Write on a dairy what bothers you and what happened this gives relax and read them times to benefit from them
-Take a long warm bath.
-change your routine
-Get a massage.
-Watch a comedy.
-stop anything that interfere with relaxing your nervous system ,like smoking or over caffeine intake,....
-sleep well deep enough sleep.
The psychotherapy component of treatment for anxiety disorders is at least as important as the medication treatment.
There are a variety of treatments available for controlling anxiety, including several effective anti-anxiety medications and specific forms of psychotherapy.
but better to be taken under doctor supervision and a thorough out evaluation of your case .
you may need only a lifestyle changes ,and if treatments needed they are prescribed according to condition and severity and it may be started gradually and when stops even it must not be stopped abrubtly so dose is given according to the case and severity and not standard .