My son lost his voice 4 days ago. The doct says it's not linked to an infection/ physiological cause

Hi Chris, My son lost his voice 4 days ago. The doctor says it's not linked to an infection or physiological cause. He does internalise everything, is extremely sensitive, precise when it comes to drawings and constructions (but messy when it comes to his room) and also extremely polite. He seems unperturbed by the loss of voice and is communicating in writing. He's bi-lingual. He's now just spent the whole weekend immersed in his own-design Lego creations - this is his passion. He's never met his father but has always known about him. This is one acute need. He is the only foreign boy at his new school (mixed). There have been two moments to date where he has been laughed at for his politeness. He is unable to be rude back. We've had several very major changes to our life over the years and I'm very worried that the loss of voice may be some form of non-cope signal. Are you familiar with such cases? Does the voice come back? My mother suffered loss of voice three times during her life after a major shock, but never so young. In her case it lasted a week each time. Should we be waiting this out? Can vocal chords be damaged by whatever is happening? Thank you for any help you can extend.