Well, Tammy, that's what makes horse races. I also have heart damage caused by chemo. therapy drugs. I don't know anything about the brain but there are quite a number of BC survivors whose heart problems have been directly linked to drugs used during chemo.
The issue, I think, is not so much that there is damage. Rather, it's that there is something that can be done. In my case, I take a heart drug every day and will probably have to do so for the rest of my life. In other cases there are surgeries which can ameliorate the problems.
Either way, we have to look at it this way. Having BC is WAR and we have no choice but to keep fighting whichever way best accomplishes the goal to stay alive. Hugs, Luci