your problem is likely due to a deviated nasal septum
on the rt side of your nose which could have been due to the fight you got into 3 yrs back, which is narrowing your airway hence you feel it is clogged up ,which also explains your difficulty during illness as during those times the airway is completely blocked .
is the treatment of choice where your nasal septum will be corrected and you can breathe easily
consult an ENT specialist
near by he will help you with this and will rule out other causes such as nasal polyp ,hypertrophied turbinates etc.