You do need to keep checking with your doctor on your situation, and take more tests.
I know how loss of voice feels. I had a nasty cold in late Aug/early Sept. It lasted for 3 weeks. I got laryngitis early on, and it lasted for two or three weeks more after the cold was gone. I did eventually get my voice back, but it is not the same as before the bad cold. Because of the internal nasal dripping during the cold, I kept coughing, which caused the laryngitis, and the coughing kept me awake for 24/7 for almost the ENTIRE 3 weeks. By the time the cold was over I was practically nuts from lack of sleep, and I still don't feel caught up, yet.
My father managed to add to my insanity. He kept calling me on the phone every day while I was sick, to check on me. He is hard of hearing, and kept telling me to speak up. UH, hey Dad I have laryngitis and can't talk louder. I told him that every day, but it didn't do any good. I literally couldn't make any sounds with my voice box, it was not capable of any vibrating. I could only talk in an air whisper, and that wasn't loud enough for my father.
I hope your problem is not serious, and that the cause is found and fixed soon.
_________________
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau