Is it possible to have only the manias in bipolar disorder?or is it anxiety?

It all started with a panic attack i once had.Then I kept havin subsequent attacks and was perscribed klonopin to calm me down.It worked well and I take it on days i feel really anxious.But one day I had a panic attack and managed to relieve it myself without medication but I began to feel racing thoughts like everything was moving fast forward and i couldn't stop it.I didn't have a panic attack but I couldn't sleep for like 3 days till i gave in and took another klonopin.My therapists belives i may be bipolar.The funny thing is i NEVER experience the depressive episodes at all I'm either normal,manic,anxious or both.I think i may have been misdiagnosed,could it just be anxiety/panic disorder thats causing it?