its very hard to cough,i always have to squeese very hard to let it out ??

[espoiri]

i have been coughing since the beginning of this year , with shortness of breath , i find it hard to cough its like i have to push very very hard to get it out , most of the time its a dry cough but sometimes its wet , and when i breath i always get the reflex of wanting to cough, my nose is almost always stuffy, and when i wake up i always have alot of mucus down my throat that's a bit dark in color almost brown yellowish , and i'm really suffering i went to several doctors but nothing helped my condition they put me on very strong antibiotics , Antihistamine and Bronchodilator and Corticosteroids but nothing worked , one of them thinks i have asthma but he didn't confirme it , i did a chest X-ray and it came out clear , i'm really worried and i still don't know the diagnosis , i feel like i tried everything but no improvement can you please help .

[espoiri]

can someone please help