I'm sorry to hear that PCOS has been causing you so much trouble. Your case is an excellent example of why I pursue individualized lifestyle medicine. I’ll get to that in a moment.

First, allow me to introduce the current scientific consensus on exercise intensity in PCOS. There exists a dose-response relationship between intensity and PCOS symptom relief. A very recent review confirms this:

“a minimum of 120 min of vigorous intensity per week is needed to provide favourable health outcomes for women with PCOS”

Here is the link to the full-text review: https://doi.org/10.3389/fphys.2020.00606

Now, here is why your experience confirms my approach to individualized lifestyle medicine:

In nearly all studies on nearly all types of interventions, there is a range of responses among the study participants. Some take large benefits, many have small benefits, and a few fare worse than without the intervention. To researchers, it’s the group average (the mean of the response) that counts. If the mean difference between the intervention and control groups is statistically significant, it demonstrates a physiologically relevant effect. In our case, the effect of vigorous intensity is positive “on average” for most PCOS patients. But the not-so-common individual who responds differently still exists. You might be one of those (I say 'might’ because I don’t know your case in detail). With an individualized trial-and-error approach, we can tailor lifestyle medicine to any individual’s special circumstances. Obviously, you have found the right therapist/health professional for your case.