All of a sudden i wont be able to take a breath in. I feel like im choking. Ill panic for a couple of seconds trying to force the breath in. When that doesnt work i force myself to cough hard. That usually gets me breathing again. I usually will continue coughing for a bit and my throat gets very sore from it. Its happened twice while sleeping and once while just sitting up relaxing. Its terrifying. Im afraid one day the coughing wont work. Any ideas?