I have this problem as well. Some of you may remember that my hairdresser (of over 20 years) must have forgotten that I'm on oral chemotherapy and was shocked one day at how thin my hair had gone! It really upset me as he asked when I would stop taking it and I had to say I won't, I'll be taking it for ever or I'll die!
So with the menopause, the chemo, the colouring which I won't give up, I haven't much of a chance! My hairdresser felt so sorry for how upset I was that he gave me a bottle of Serioxin shampoo. I may be imagining it but it doesn't seem so thin on top as it did. He also dyed a line of hair which he's going to give me to attach round my head to help disguise the worst of it, that's the theory anyway but I can't imagine how it's going to work!