I know that it must be upsetting to talk about your breast cancer but please know that your story is very inspirational. Reading about how you fought it and survived makes me realize that life isn't always fair but when we dig down deep, we are all a lot stronger than we know. It continually amazes me how strong the people on this sight really are, especially when I read stories like yours. It's also nice to know that should we have weak moments, everyone else is here for immediate, unconditional moral support!
My MIL is a breast cancer survivor and I am so grateful that she's still with us.
Like you, I use soy milk, mainly for oatmeal in the morning and for baking. I haven't noticed any changes (like breast tenderness before a period) but have thought about trying rice milk anyway just for variety.
Hope you like the rice milk and thanks for sharing your story.