I read somewhere, many years ago, that when Rock Hudson first started acting, his voice was squeeky.
He was advised to go to the top of a mountain, (presumably for the clean air), and yell as loud as he could.
I will caution you, that afterwards, your throat will be rather sore. Some gargle might be a good idea. Plus, remember to take a bottle of water, (or two). You will get thirsty, yelling in that environment.
Though, to be quite honest, the thought of it sounds rather good from a theraputic point of view anyway.