When I had the arrest they revived me with a shock from a defibrilator, I didn't know what had happened until they told me.
They said - when they were checking the heart valves the cath tickled the wall of my heart and sent it into an abnormal rhythm (Ventricular Fibrilation) and I arrested immediately.
My cardioligist said it can also happen because the dye is thicker than blood and if you have severly blocked arteries the thick dye can cut off the blood flow.
I had two 90% blockages in the left arteries and one 70% blockage in the right, I was admitted straight away and had a triple bypass 2 days later (Oct 2009).
My Angio was also through the public system (John Hunter Newcastle) - but I can't complain, they saved my life.
I'm fine now and the Angina has gone.
It might pay to take 2 days off work just to be on the safe side.
Ask your Doc for a couple of Valium to calm you down.