Hello Mark, thanks for the query. Frankly I would say you are the patient of Asthma ( two forms 1-cardiac form 2- bronchial asthma
). Since your 's age is above 50 yrs so any type of asthma may be. Now a days asthma is not a serious disease but definitely it gives some trouble to the patient. Sudden wake in the night due to episode of asthmatic attack is a most common feature. Since in the night temp fall down so slight constriction ( of bronchi in lungs) is there hence patient feels suffocation. Cessation of breath is there and feeling of uneasiness is also. Regular health check up and do excercises which increase your's lung capacity. Once lung capacity increase you will feel slight relief. Beside this you have to take some good quality type inhalor. If option is medicine orally i.e. Bronchodilators late in the night 3-4 hours before sleep. Anxiety
is sure but please relax. Good luck for your healthy life. Dr. HET.