Feel sick after hearing a certain song?

Alright so i just started listening to "simple and clean" which is the theme song to my favorite video game. almost instantly after remembering the lyrics, I began to feel kinda sick in my stomach. it was almost like i was gonna throw up but i knew i wasnt going to and i felt sad. I've always ociated this song with good memories but i kept crying. does this kinda thing happen to anyone else with any other song? im thinking its probably just a kind of nostalgic thing but i dont know, I just wanna know if im some kind of oddball or if it happens to others.