I experienced what appeared to be a sudden onset of cardiac issues. An evaluation by a cardiologist ruled out cardiac disease. The problem lasted about two months and now happens only once in a while. My hart rate has increased and my blood pressure decreased - a side effect of PD meds. I find that I experience a greater since of anxiety in the mornings. .25 of Xanax helps me stay relaxed. Slow, deep breathing and alternate nostril breathing helps tremendously. Physical exercises are outstanding for dealing with Parkinson's. Also, be observant of how protein ingestion affects your meds; this is a big issue for me. Good Luck.