Shortness of breath with Costochondritis

[nh_user_1333941]

I had very bad posture for like 1 month and done sports excesivly evrey day untill one day i felt a strong pain in left side and shortness of breath .Went to the doctor and done blood , x ray test and nothing .I have a clean medical history . My neurologist told me i have intercostal neuralgia but i think he is wrong , the symptoms tell otherwise that i have costochondritis. My question is (i dont see much on internet about this) , i sometimes fell like i dont get enought air so i want to take a deep breath but i cant , like my rib cage doesnt let me .I can breath better after i drink or eat something or doing streching or just massaging my chest or 1 minute of diaphragmatic breathing , is this an symptom of costochondritis or its not ? (sorry for bad grammar english is not my first language)