I doubt you will be ready to work in an auditory environment. Your sensitivity to sound likely means your brain is struggling with auditory processing. Your auditory memory is also likely a problem.

If you could do some very simple one on one counseling and can limit your clients to very simple communication, no emotional and complex discussion, you may be able to slowly build your tolerance to work. Group counseling will be extremely problematic until you recover to a high level.

A Neuro Psych Assessment would be worthwhile to determine your actual capabilities and weaknesses.

The toxic qualities of your work environment will be your biggest struggle unless you can get your management to set up some protective systems for you.

My best to you.