It seems from the history that you have taken antibiotics for treatment of tonsillitis
following which you are having ringing sound in the ears.
This is called as tinnitus. The common causes for tinnitus are problems in the inner ear like meniere's disease, labyrinthitis
and side effect of antibiotics.
In your case it seems like you may have tinnitus as a side effect of antibiotics. The common antibiotics causing tinnitus are ciprofloxacin
, gentamycin, tobramycin
Hence I advice you to check for the antibiotics which you are using for their side effects.
Hence do consult your doctor for examination and treatment accordingly.