Breathing problem occurs. Be my problem?

Since almost a year I have been facing the breathing issue. Chocking issues leads to "vomit kind of coughing". But vomiting never happens nor any sputum comes out. Even when I wear mask this chocking happens. By the way I don't have any fever Two days back I did a chest x-ray, it came out normal. Almost five months back I did HD Chest Scan, 2D Echo , X-ray chest. All my reports came out normal. I take BP medicine( Olkem 40 mg) , never had asthma, I do get tensive easily in adverse situation, I don't smoke but I drink thrice/twice a week. Started taking Monteck LC half a tablet in the night, but no relief. I get a sound sleep, but because of the current breathing issues I take one Alprax 0.25 mg at night. What could be my problem? Kindly respond.