Addrall's a powerful stimulant, if you find that you are nervous, anxious or depressed a bit too much after they've worn off the normal effects of euphoria and concetration, then slow down on them and lower the dose. So to your question is yes all of that can be explained for the residual effects of any stimulant will cause insomnia, anxiety or depression. But don't fight back with more because that will only lead to abuse and:

Too much makes you psychotic over a period of time.

Don't let the drugs abuse you more then it.