Should I Be Concerned About A Painful Canker Sore, Bleeding, And Body Pain After A Fall?

I have a canker sore and it hurts really bad and i think its because of my bracers hurts so bad and it starts bleeding out of nowhere and I just had a concussion about a week ago on Wednesday of last week never got checked out but arm and back hurts really bad I fell of the bleachers 7 bleachers and if there was nobody on the 8th bleacher I could’ve died or gotten hurt worse.