welcome to health care magic
As per your details, you had head injury
few days back. First thing you have do is visit a neurologist
and get CT / MRI brain done to rule out any organic lesion in brain which might be causing the symptoms. Secondly, concussion injury
can cause any of the symptoms - depression
, lability of mood etc. If organicity is ruled out, then psychiatric consultation is advised as there might be some psychological component responsible for your symptoms.
Hope it helps