OK. At first I thought I was writing about elective/selective mutism. According to Google, I'm not. Now, I'm not sure what the term is and I'm stuck in a similar catch-22 situation to wanting to check the spelling of a word in the dictionary, but needing the correct spelling in order to look it up. So. Here goes.
I have a character who has not uttered a word in 14 months. He is physically capable of speech but has steadfastly refused to utter a word. (From what I understand from Google, with selective/elective mutism, the person is unable to speak in social situations due to extreme anxiety/stress. That's not exactly the case, in my fanfic. Basically, the character committed an act for which he feels such self-loathing that he's shut himself off from the outside world. There ARE people who come in regularly to check up on him. He ignores them. He's not catatonic--he's very much aware of what's going on around him but does not elect to participate in any meaningful way.)
1) Is there an official name for what I'm describing?
2) After 14 months, if he decides to speak, for whatever reason, would he be able to? Right away, or would he have to strain? And how long before his voice would return to normalcy?