Cant breathe normally. Plz help me out!

From a lillte chest pain i searched intenet and all of sudden i had breathing problem and suffocation frm my lower neck...from then i cant breathe properly, as if something is stuck in my lower throat...there was a little lump in one side..it was painful a little...my doctr gave blood test and thyroid ultrasonography...but all the reports came normal..nothing is there...but still i feel the stuck feeling in my throat and cant breath normally...as if i m manually breathing forcefully...i cant breath automatically from my body...i m taking medicines...even though the feeling is not going...i do have a little dry mucus my throat sometimes and the middle of my upper chest pains while breathing deeply...i cant breath deeply as normal...plz help me out