First, change your routine. Stress can affect your hair. It also applies to what you use on your hair. dry and frizzy hair is sign of chemically damaged hair. Then use a conditioner that is rated for those kind of hair but use a comb when applying the conditioner. Run your hair though water to rinse it thoroughly but don't use your hands and just let the water carry the wastes. Treat your hair in a salon and condition your hair through different treatment methods. You can have their expert suggest you on what treatment to use. Most importantly, do not use shampoo daily and have your natural hair oil treat your hair. Also, check if your shampoo doesn't provide negative results and if it does, change shampoos.