Periodic Throbbing, Sharp Pain In Lower Chest When Sitting Straight Or Deep Breathe, Feeling Of Someting Stuck In Throat, Soreness And Red Throat. Opinion?

Hello, i woke up yesterday morning to a sharp pain in my lower chest, it seems to be centered in that area. I ignored it at first because i thought it may have been bad sleeping position related, but throughout the day the pain didnt happen when moving at all and there is no pain in my muscles when stretching that area or pressing on it. Its only periodic, and seems to only happen when i sit up straight or breathe deeply, and it occasionally starts throbbing. And shortly after i began feeling like i had something stuck in my throat in that area, but no matter how much i drank or ate to get rid of that feeling it wouldnt go away, and showtly after that my throat became sore and i noticed redness in my throat, im just wondering if you had any insight as to what the issue is.The pain would be probably a 5 out of 10