I'm sorry you are experiencing this. SSHL is not common. Most hearing loss happens gradually. However, people on MCC have shared their experience with SSNL. You did the right thing by seeking immediate medical attention. It seems that steroid treatment only works if it is given very quickly after the hearing loss incident. However, it does not always work.

It's helpful to know that hearing loss technology has improved greatly over the last few decades. Hearing aids are better than they used to be. Bicross hearing aids can transfer sound from a 'deaf' ear to the hear that hears when there is single sided deafness. So some single sided implants.

If the damage is in the cochlea, which it often is, a cochlear implant may be a possibility. The large majority of cochlear implant recipients have excellent results.

I am unaware of HBOT treatment, but encourage anyone who has experience with this to share what they know.

Was there an incident of some kind that may have caused the SSHL? Were you on an airplane? Were you exposed to extremely loud sudden noise? Is there possibly a genetic connection?