Is it possible for clonazepam to cause anxiety and heart palpitations and panick at night? anything is possible right?

Clonazepam: Generally Clonazepam calms anxiety and panic, rather than causing them. However, in some people there can be a paradoxical response to benzodiazepines, or possibly more gasping if you have sleep apnea. You may be glad to know there are other ways to treat panic attacks -- including talk therapies and other medications. Please consider working with a psychiatrist if you aren't already.

Highly unlikely: Unless you happen to have untreated sleep apnea and lost significant oxygen from the respiratory suppression of the Clonazepam and then awakened with a gasping arousal that then went on to trigger your panic. If this happened to you then you should see your family doc for a referral to a sleep specialist. Best wishes.