Do know that there are also visual stethoscopes out there- you would simply have to learn how to use one! More or less like learning to read an EKG.
It might be possible for your employer to buy a bluetooth phone/pager for you. Or get a bluetooth cell phone
- and aids and have them paired with bluetooth hearing aids. You would then use this phone for your work. (tax deductible). There will soon be a bluetooth stethoscope available as well. As the previous poster suggested...contact Voc Rehab!!!
I would think that if you couldn't hear sounds through the stethoscope, you would not be able to get through nursing school. The important thing here is not to fake it! Ask someone to hear sounds for you if you don't quite hear something! There are scopes you can use with earphones so you are hearing through the hearing aids. This might help as well.
There should be a disability services at the college you are attending. Also see what they can do to help accommodate you!
There are completely deaf people working in the medical field as doctors and nurses, so don't give up!