What do あなた do to feel better when あなた have a bad cold または flu.

Ok So a few days 前 my cold started coming after sleeping over my フレンズ house her cousin had a cold and she wanted to sleep in the same room with us.She's 6 years old and i think i caught it from her because she slept on the floor with us and she was coughing on me the whole time and my friend told me not to worry because she's almost better.It didn't look like it she even vomit on me a bit and i wanted to go ホーム and シャワー but my friend 発言しました if i left she 発言しました that she was a afraid i wouldn't see her for a long time and i have a ハート, 心 for people.So i changed my clothes and stayed there because i felt bad.I Think i have the flu now because i have been feeling weak and i had a huge headache i even fainted.Please tell me if あなた think its the flu または just a cold.If あなた guys are sick i hope あなた feel better soon.