Hello and welcome to HCM,
At the offset i would like to assure you that it may be just a simple problem and you have nothing to worry about.
Regarding the injury
which was quite severe but did not lead to unconsciousness
, you must understand that most head injuries do not cause unconsciousness but they can still be severe.
A condition called subdural hemorrhage
can occur which is reflected in mild lethargy
and heaviness of head and nothing else but is quite serious and should be treated as soon as possible.
As far as your condition is concerned i would advise you take a CT of the brain and get back to me or any ENT with the reports.
Take steam inhalation and do not strain
take care and get well soon
Dr Sriram Nathan