My kitten has a sore throat , what should i do? as he caught a cold 2 days ago , you know ..he is a little better but i found out that he has

So he cant breath quite well , is thier any fast thing i can give to him ? They say Olives oul is good for cats and specially for cold ..true???i have it ..and i have nose drops but i feel like it cant help ,also i made steam last night for him but then i found out it makes it harder ,its like he cant breath ,barely breathing , so i stopped that..thank God he is eating and drinking and i wipe his eyes and nose ..but no medecine because i dont know whats better for him and i dont know what to get..So I just put the olives oil on his nose ,as they say it makes it easier to breath . Please if you know anything tell me what to do now ..he sleeps while sitting ..most of the time i find him sleeping while sitting so i think thats because he cant breath well ..