Hi, I am a mature Beauty therapist with grey curly hair of which I have blow dried to just wavy. I also have an under active thyroid condition which means my hair gets very dry & out of condition. I have tried all sorts of serums, Argan oil, conditioners etc, but they make it lank & style son comes out quick. I had it cut shorter so I could have more blonde hi lights, but this makes it worse. I feel really fed up & aged al though I am a young 50. Does anyone recommend what sort of colour I can go & what brand. I have been blonde all my life until now