Hi ! Head injury
can cause all the symptoms you have described. But to pin point this as a cause and to exclude any truama to the pituitary, you have to consult your family physician who may advise you to go for a CT scan
of the head. The loss of hearing may also be due to local trauma to the ear drum or due to a direct effect of the head injury. You may also need the help from a ENT specialist
if it does not subside.
Wishing you an early recovery.