Last Night I Fell And Hit My Head On A

last night i fell and hit my head on a wall and my friend who was there said that i went numb for a few seconds so he picked me up and he saw my lips were completely blue/purple. i dont remember falling, hitting my head, or him picking me up. but when i came to, i could not breathe at all. once i slowed my breathing down, i caught my breath. it took about 20-30 seconds before i could breathe normally again. my friend said i was only blacked out for 10 seconds but since last night, i have had a very bad headache and sometimes a pounding headache. it has been about 23 hours since.i have also been acting slow such as being forgetful, not thinking straight, and messing up a lot when i type, write, or say something. i told someone what happened and they said i could have a mild concussion. is this true?