Could it be possible that the use of fake legal marijuana that i use to smoke and quit two years be the cause of panic attacks and sleep disorder?

Unlikely: It's unlikely that using the marijuana caused panic attacks or sleep disorder. It's more probable that your underlying medical and/or mental health concerns led you to try and use marijuana as treatment. It's very common for people to use recreational drugs to help with underlying concerns and its important to seek professional medical help for legal and healthy ways to treat those problems.