This sucks, but don’t sweat the cardiac cath. My 80 year old mother had one done this fall. It was a breeze. Light sedation, three hours tops. Two balloons and a stent and instantly feeling better afterwards. Went from 95% blockage to 30%.
Make sure you take the meds, though. Without them the blockage can return quickly, especially with the coarse texture of a stent. One of the meds keeps it wide open. Another one is likely to make you feel colder than normal, but in her case it makes her hot all the time.