What you describe sounds like too high of a dose or the wrong medication.
There are two types of stimulants: methylphenidates and amphetamines. Individuals do well on one or the other, but rarely both types. Focalin is mostly a methylphenidate, but has another component as well. It may be time to try a simple methylphenidate, like Concerta or Ritalin, or a simple amphetamine, like Adderall or Vyvanse.
However, amphetamines should not be taken with Prozac.
Here’s more on finding the right medication for ADHD for your child:
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism