Oh that sounds awful, I am so sorry! Getting words into conversations is tricky, I especially struggle with this. Some people are just too nervous to speak out loud or are just unable to due to an underlying issue. I hate all the pressure we have to go through just to speak out loud or to jump into a conversation. Sometimes speaking out loud just isn't feasible for some people. Reasons can vary, whether it is an inner ear issue like yours, anxiety, articulation , etc. Signing can also be the best way of communication if an environment is too loud or if you are in a setting where you cannot speak. Whispering is more distracting in a test room setting than sign language in my opinion. I really hope your appointment goes alright. 
Much love,
- Anja
