I got the same problem. My doc also advised me to take isocort prednisolone methylcobalamine inj and my usual hypothyroid med. My ringing started 3 weeks back and now I feel somewhat better but not completely cure. I hope you will share your improvement also.
My hearing problem is resolving (about 68%) within this past 4 weeks with steroid and methylcob inj. But still some ringing inside my ear is there.