letmein
Thank you both. J52 My daughter mentioned Argan oil but I didn't pay attention 
Foxtail I was using Olaplex purple but think maybe too much or too often, as it went quite a dull colour, so I didn't go back to it since the hairdresser did it. I could use it once a week or something like that though.
Thanks ladies xx
That looks like a clue! My hairdresser explained to me that strong repair-type treatments based on keratin really need to be used infrequently by many of us - and then only by those with thicker, darker hair. Olaplex products have had quite mixed reviews, and a common complaint has been from those finding themselves with dry, dull, frizzy, broken hair and not the glossy results they wished for. It’s taken 6 months to sort mine out!
A short pixie cut will help a lot as you’ll be getting rid of a lot of damaged hair. Stick to regular scalp treatments with olive oil and a hot towel, or coconut oil. Really good hair products are made by Kerastase. Be patient, your hair will recover, but in the meantime avoid anything with harsh chemicals and promising a quick fix.