Welcome to Health Care Magic
There is no alternative to seeing a doctor.
History of fall- persistent headache- forgetfulness- all point to the need for immediate investigation.
You need CT or MRI
brain to exclude Sub Arachnoid Haematoma
/ other space occupying lesion.
It may be risky to postpone - discuss with your parents and see a neurologist
, as soon as possible
Wishing speedy recovery