Normally, the first piece of advice would be to not relax at home (where so many people have problems), but you did the right thing by visiting a pro.
Unfortunately, even the professionals sometimes make mistakes. However, you can nurse your hair back to health. Keep in mind that it will take time and dedication, so don't expect a magical cure overnight.
The first thing your hair desperately needs is protein. An emergency treatment, such as Injibs Scalp Therapy Treatment may be required for tresses in truly bad condition.