Dry hair can manifest in several different symptom including split ends, brittle and breakage. All these damaged hair sometimes quiet hard to bring back to healthy condition.
There's some important things to do in dealing dry hair. Mostly you must wash with a moisturizing hair shampoo and also use conditioner. Some hair care product may have some form of hydrating shampoo and conditioner. It's a good idea for you to have some trial and error test to identify which brand work best for you.
Please stop hair coloring activity,such using red hair dye, at least for a while to give time for your hair to recover and regain its natural health. And don't forget to stop blow drying using hair dryer as it will worsen the problem. Do meet your hair stylist if still can't get it better.