You wrote:
"Since I’ve become aware my alters or parts have become very “loud” and demanding . "

This has also been my experience. One of my parts, Billy, has also been taking charge more. At my next appointment, my T will be teaching me containment techniques. Right now the best way to quiet everyone down is to press a pressure point between my thumb and forefinger on my left hand or to hold something cold with my left hand. I'm thinking loud jarring noises would also help, but I haven't tested it.