'it makes me sick to my stomach" what does this phrase mean? i came across this phrase while watching the popular tv show- HOW I MET YOUR MOTHER

does this site really help learning d language(english) to the level of a native speaker?

First notebook entry: Introducing myself i am lerning english, infact sort of actual english (native i mean), my native language is hindi, and i am from india as you would have guessed! love reading, playing outdoors and hanging out!