Thank you for the information,
The sound in the ear can be due to tinnitus.
There are many causes for tinnitus , but some times no cause can be evident also.
The causes may be -exposure to loud sound, ear wax, stiffening of bones of the ear or otosclerosis, Meniere's disease etc.
There may be vascular causes like high blood pressure
, any blood vessel malformation, or any abnormal flow of blood may lead to this feeling.
Sometimes anxiety , depression or taking of medicines like antibiotics , aspirin , water pills etc. may also cause it.
The other possibility is a block in the Eustachian tube from throat infection as you had.
In this case taking anticold tablets & nasal decongestant can help to open up the tube & relieve the symptom.
If these do not help, you need to consult an ENT specialist to have an examination of your ear.
I hope this information will be helpful.
Please ask if you need any clarification.