Hi I Have A Pain In My Tailbone. So It

Hi I have a pain in my tailbone. So it all started 11 days ago, while in school somebody pushed me against the door I remember after that I felt alot of pain. When I was walking I felt pain and while sitting. Now after 11 days feel slight pain. Will it go away in like 20 days? Cause I am going on a holiday in the USA and I want to be okay until then. Please help!