oh I have that problem still, even though I know I can do the voice every time (it's actually impossible to do my old voice any more, no matter how hard I try I sound like a woman impersonating a man, which is true lol). But I still have a strange habit of whispering when I get nervous. I think it's some thing that will pass once you build up confidence, I really only do it now when I'm talking to some one intimidating.
Raising your voice will not change you back into 'boy mode' either, when screaming in pain or if I'm having a big tantrum and yelling as loud as I can, I sound like an angry woman. The only thing I find very odd, if I vomit I sound like an angry viking man running into battle. I have no idea why and can't help it. The only plus side is I don't do a lot of vomiting in public (not since I stopped drinking lol).
Spiro was horrible and I had my endocrinologist take me off of them. I was having to pee so often it was badly affecting my quality of life, I would wake up 6 times a night to go to the bathroom and maybe get 45 minutes of sleep. On the subject of voices, the diuretic effects of Spiro left me so dehydrated my voice was constantly 'raspy' sounding, like I had been walking through a desert for days. Even after drinking Gatorade and coconut water non stop I was still dehydrated.
I have been put on Androcur instead and have literally had zero side effects (other than all the good ones, like less hair growth etc).