Hi Shyam,
Welcome to these AYP forums, first of all if you don’t trust it go to a doctor.
I did not read all the old posts. Just would like to answer you, with purification we can here our nada’s, our inner sounds like Yogiswara mentioned. The one you mention is chin or chinchin, sound of crickets or bells. Mostly we will hear this in the left ear.
Nada is the inner sound, your connection with the Universe. It will change, there are 9 nada’s and it is a sign of purifying the nadi’s. 
Thanks a lot
I heard this is very positive development
Mr kishore could you recommend to visit doctor he extended my medication to 10 more days …that medication is taking care of virtigo (nerobin and other) do you think it will work
I found that the ringing is related to imbalance in the ida/pingala.
When both are balanced there is a deep silence. I experience a louder ringing when the pingala energy is high.
It’s the nada, it’s well documented in the yoga upanishads where it is said we should let the mind dissolve into it, subtler and subtler sounds may be perceived along with the divine sounds of drum, flute, harp-like instrument, tinkling ornaments ect, it is a very good sign:)
I think I heard the Om sound for the first time.
I was on a bike ride and thought a hornet was approaching me and got a little scared 
but there was no hornet. 
What I am observing is that when the frequency of the ringing gets higher the sound gets very subtle.
With these higher/subtle frequency sounds comes a ever deepening silence. 
Yes, you are hearing inner sounds. Good progress. The purification process is shifting to a higher gear.
Keep up the practice! 
To be honest I haven’t done any formal practice in 2 years.
It happens on its own, I am not the doer literally.