[Katie]

Thanks Katie. So, am I right to assume what you are suggesting that it's as much mental as physical then?

I beleive so, yes, or at least for Me anyway.
Oddly, Yesterday, I spent almost the entire afternoon talking in a higher register than "Normal", no apparent trigger or reason either, it wasn`t doing any harm so I just went with it LOL
Today I`m pretty much back to "normal" again.