I fell while snowboarding and hit my head and im scared i have a brain tumor?

i fell while snowboarding i didnt have a concusion i just got knocked out for maybe 3 seconds my freind said and i also began to notice anxiety after the fall but ive always been a worrier i see a little double vison and im just scared that i have a brain tumor so please someone tell me can you get a brain tumor from falling once???? pllleeeeaaaassseeeee