Anxiety neurosis, now known as panic disorder, is characterised by sudden palpitation, ghabrahat, choking, and several other symptoms for a short duration and is self remitting. If the attacks happen frequently, the person has to take medications which restore the chemical disequilibrium that is the cause of the symptoms. The cure is by medications and also by learning relaxation exercises. Also to tell oneself that the sudden choking, or ghabrahat is not something to worry about, and that it would go away in a short while, so not to worry about it.
Also you need to take a review from your treating cardiologist for the questions regarding IHD, and also that sometimes breathlessness in sleep needs to be evaluated by them as well.