Hey ! my problem is bit complex … as i just dnt know how to explain the situation … ok let me try …
Sometimes it happens to me that I simply can’t breath … for 10 to 15 seconds … enormous pressure builds inside … which can clearly be sensed by my facial expressions at that particular moment … after all that i get normal as nothing happened … my parents say this abnormality was noticed when i was 3 years old … at that time my whole face just suddenly went reddish…. but then I recovered … they consulted doctor at that time … who said that this will get better as I grow … but believe me i have never found any improvement in it … i myself went to a doctor … he suggested that i might have some heart problem …. he checked that all … and marked me clean …. so it remains mystery … i have never seen any other case like that … and yea one very important thing to mention here … it usually happens when i am about to have some sort of viva , quiz or presentation …. which make me embarrassed in front of teacher and audience … but sometimes in routine too this mystery happens … i have never talked to any friend about it … as it really can be an hurdle in my professional as well as remaining student life … 
If anybody of u knows what’s this all …. plzz help me out … if u don’t then do consult with some one u think who may have some idea about it … and if unfortunately there is no medical definition of it or cure … then if there is some sort of physical exercise or temporary solution of it let me know.