What you are experiencing is called TINNITUS. It is an unwanted noise in the ear produced by minor inner ear disturbance. Majority of times it is not serious and will gradually fade away in a few weeks. It is usually associated with reduced hearing in the affected ear.
Next Steps
You need to see a ENT Doctor for ear examination and hearing test for further advice.
Health Tips
Tinnitus usually gets worse at nights or when it is quiet. Listen to soft music at night and try to divert your mind.