Thanks for your query
How much did the metallic object penetrate your head? Was the cut in scalp large? It may need stitching.
You need to apply local antiseptic lotion and may need to take systemic antibiotics depending on the wound condition to prevent infection.
Did you have a course of tetanus toxoid
before? If you dont remember of it then take tetatus toxoid complete course + Human Tetatus immunoglobulin.If u took complete course or booster dose within 5 yrs then its not needed.and if u took the course within 5-10yrs then you will need only toxoid 1 dose.
For local pain and swelling you can take paracetamol
& seratiopeptidase .
Your neurological problems need to be evaluated ... so please visit a neurologist
and get a check up
A CT scan
of brain needs to be done and checked for intracranial hemorrhage
and treated likewise.
Dont self medicate
Update here how you stay.
Take care :)