I am Dr Mbong. I am sorry to hear about the fall. The symptoms your describe make me think you probably have some head and or neck problems from the collision and fall.
It may be a simple brain commotion (due to the brain moving from the collision and for which the symptoms will go away with time) or (and I hope not) a probable cranial box or neck bone trauma/fracture
which can cause other severe complications.
PLEASE rush to the ER for consultation, proper investigation and treatment. You may need a brain scan.
Wish u quick recovery,