Have you been through a stressful event recently? I had a stressful few months at the start of the year and my hair was coming out in handfuls. I had blood tests and apparently everything was normal, but for some people hair loss is a sign of thyroid deficiency and should be checked out.
I've been using Perfektil hair and skin supplements from the chemist and they really seem to be encouraging hair growth. Maybe you could try something like that? Different colours and hairstyles will just mask the problem rather than fix it.
Good luck! it's awful to see your hair clumping round the plug hole.