my husband , age 43, working in a corporate , has been suffering from sudden breathing problem usually during mid night. he wakes up with a start , coughing but also choking, rushes to the open balcony or window, opens his shirt and acts wild . i try to give him water , message his back and after about ten to twelve seconds he is normal but very tired . his doctors are telling that it is because of stress. His reports like TMT, PFT, Echo ,blood are ok. Can you tell me what is the actual problem and the remedy?