How Can Hair Breakage With Damage Be Treated?

Hi dr, i have always had straight hair but about 2 months ago many strands have suddenly become curly, bumpy wavy , frizzy rough with lots of breakage . The hair looks as if burnt and damaged. it started with a few strands but it seems to be increasing fast. I am very worried. My age is 39 and my height is 5'4. I consulted with my dermatologist and she said that it could be due to some protien deficiancy. i have already had some protien supplements and vitamins for the past 2 months but the condition seems to be deteriorating. Please help ,sm.