Hello Sir M 25 Male..iam Feeling Breathing Difficulty From My

Hello sir
M 25 male..iam feeling breathing difficulty from my throat..i have checked from my doctrs they said ur chest is all clear..i also have problems with my abdomen..im diagnoised with IBS..bt i feel very difficulty from my throat while lying on back or on my sides or on stomache...after 1-2hours breathing gets smooth n alright..bt most of the time its diffucult only when i ly on back..then i cant even swallow air for some time..i have no wheezing no cough no fever no ankle swelling..no pain in chest..bt only have very dull ache in my middle of throat when i ly on my back..but it goes in seconds..plz help me..m fed up from this kind of thing..