Are you a veteran by any chance? If so there are health technicians for hearing (audiology) all the time posted which you could be trained to do.
I know most of the audiology health technicians (who are basically audiology assistants) had on the job training and have not completed any real training program.
I know of one person who completed the NOVA program. They are an audiology assistant and basically do hearing screenings for the newborns and minor hearing aid repairs (which it sounds like you doing part of this work now). They liked the program, but admit it was not worth the money since they are basically paid the same as any other assistant would be paid.
I know at one hospital I worked at I trained one of our secretaries to be an audiology assistant. Taught her to do basic repairs and cleanings and how to fill out Medicaid hearing aid paperwork. If your hospital you currently work at has an audiology department why not talk to the person in charge of that department and see if they would be willing to train you on the job and let you take over more duties for the hospital since you are already doing the newborn infant hearing screenings. Why spend money on a program that you can be taught how to do on the job and do the same work?
Another idea for you:
Why not go to school for medical assistant and then try and get into your hospital's ENT office as a medical assistant/audiology assistant? You would actually get to see a lot of cool stuff, help out with post ops, etc.
In my ENT experiences I have seen medical assistants do lots of things audiologists are not allowed to do (and I'm not going to debate with anyone in this thread about the ethics of this. Feel free to post a thread and we can discuss it if you would like to folks). You would be doing the things you love to do and have some education that is portable and a decent paycheck for it.
And one last idea:
You might be able to get an age waiver if you are in good shape and can join the military as a direct commissioned officer in social work and then cross train as a health tech for audiology (I cannot remember the MOS or job title for this but they exist) and then you would get to do some of the things you wanted to do!