I have experienced this.
For year, I had been experiening chest pain, which had been diagnosed as related to my COPD.
After taking ONE new rheumatoid drug, I had a serious allergic reaction . After hours in A&E, I was shocked to be told I was being admitted to coronary care, I had had a heart attack.
All the scans and were clear; clear arteries, healthy heart etc.
I was asked if I was willing to be part of a BH F funded research programme into investigating why so many women in the West of Scotland were dying from undiagnosed heart attacks.
It took six months of scans and investigations , which eventually diagnosed microvascular angina, formally known as Cardiac syndrome X.
It was called this, because it was extremely difficult to diagnose.
It transpired that the pressure in the micro vessels inside my heart was dangerously high.
Unable to be sedated, I got to see inside my heart, when I had a very invasive angiography. It was fascinating.
If I hadn't had that first heart attack and been part of the research, I would have been dead by know.
I did have a second heart attack, while I was shielding ( scary stuff), but it was mild, due to the amount of medication I was taking.
It was trial and error as there was no definitive treatment for this condition.
A few years later, I became unwell and a bold trainee GP phoned the professor in charge of the research. I was in hospital the next day.
Apparently, his research has changed the way, women with chest pain are diagnosed.
I will be forever grateful to Professor Berry and his team at Glasgow Queen Elizabeth Hospital.