Klonopin for anxiety and insomnia?

Any one tried Klonopin?  My aunt takes it for insomnia and I read that it also helps with anxiety.  I have both and I am going to begin ADHD meds on Jan 31st.  I already have severe insomnia and I'm scared it'll get worse with medication.  Has anyone used this/had any luck with it along with ADHD meds?  Should I ask my doc to prescribe it when I go in to get my ADHD medicine?