What Can Cause Difficulty In Breathing ?

My case is very confusing, i have been to all kinds of doctors and none of them knows what the problem is. It all started 2 years ago when i went jogging, i came home and i was feeling well but at night while i was sleeping i woke up because i was not breathing(at all), and i was very dizzy, it tokk me 2-3 seconds to realise that i was not breathing so i decided to force my self to inhale and so i did but with difficulty and a sat on the bed and fainted. Since then i was gettig tired with exercise and the same things happend and still happen occasionally at night but now it gets worse. I went to a lung specialist and i was treated for asthma with no results(ventolin,seretide,singulair,aerius), i an not alergic, my spirometry is in normal levels, oxygen is 98% wit hthe device they put on your finger,my heart is ok(ecg,eco,blood tests,tredmile test,holder for card rythm). Another symptom i have lately is feeling my throat being hard, i asked if the throat could be the reason but all doctors said no without chekking my throat. Is it possible to have dificulty breathing due to a problem with the throat? What other reasons could cause this? In addition now i have something called menieres syndrome and this also started the first nigt i had that terrible experiecne, i was sure that i was about to die that night and could only think about the pain of my family for losing me. Thank you.