Suggest Treatment For Headache And Stuffy Nose

i was at soccer and another girl and i collided heads. this was 2 days ago. i still have a headache. Ive had a few concussions in the past and if feels like i got another one. Today i woke up with a 100 degree temperature. Im 14 and i dont know if this is serious or not. I also have a stuffy nose so i might just be sick. what do you think?