I am Dr Mbong. After a head trauma
, one may sustain an internal head injury
(such as a bleed of sub-dural origin) which may get bigger slowly overtime and cause symptoms months after.
So though it is 4 months after what you had, it is advisable to urgently see a physician for examination and a CT scan
among other investigations to make sure that the symptoms you described are not related to the head trauma you had.