If it makes you feel any better, you are definitely not alone! I have straightened my hair for years and damaged it so bad. When I decided enough was enough and I couldn't keep frying my hair, it took months for my curl pattern to form again. All hope is definitely not lost, it just takes lots of patience. Definitely lay off the chemicals and any kind of heating tools from now on too. It may also be beneficial for you to cut off the damaged hair, so it can grow out healthy again. You may find this video beneficial as well: Natural Hair: Heat Damage recovery & repair journey - YouTube
Hope I managed to help out a bit!