Wow- thank you!
Thanks so much, Firefox 7275! That' s a lot of really good information! I'm sorry that I haven't responded until now. I've been away. I appreciate all of this information and will look into those two brands of shampoos and all of the other ideas. They're a lot to consider changing all at once, but they sould valid, and I will look to making a change with the shampoos, first, and of course, diet (the way that I've been eating has needed to change for some time, so that is a definite piece of the puzzle that I'll attend to).
Thanks for the thoughtful explanation- all of it good.