Given the data you provided (overdosed with Adderall, feeling anxiety), you might be experiencing withdrawal symptoms. Adderal is a brand-name psychostimulant composed of several components, certain of which are amphetamines. This medication is known to have significant abuse and addiction potential.
Withdrawal from chronic use of amphetamines can include anxiety, depression, agitation, fatigue, excessive sleeping, increased appetite, short temper, psychosis and suicidal thoughts.
As you can see the symptoms might vary a lot. As with many withdrawal symptoms they are strongest about several days after you stop taking the substance.
You might want to visit a psychotherapist or a support group in order to learn how to cope with this condition. Although the medication had left the system, the receptors that the medication attache to, keep looking for it and cause the withdrawal symptoms. It would take time for the receptors to start recognizing the new condition as quite normal. It might be important to solve the problems that lead to the abuse of the substance in the first place (problems at school, with friends, in the family). Otherwise you might abuse another substance and start all over again.
In the end, I personally think that you are doing the right way. The fact that you want to improve the things tells me that you will succeed. Just be patient and keep fighting against the substance.