Has anyone had a similar or related issue?
Your symptoms suggest sleep apnea which is frequently associated with PCOS.
To answer your question, yes, I was exactly like you when I was young (except without the PCOS, I'm male). Gradually over the years it got worse. It can get worse. This problem pretty much ruined my life. Until very recently, I never met a doctor who could help me. Like you, I took antidepressants because that was the only treatment offered to me. Antidepressants improved my mood but didn't fix the underlying problem.
Last week, after 47 years, I finally found out the cause of my problem. At least I think I did -- I don't yet know for sure.
In my case the problem is probably upper airway resistance syndrome (UARS). This condition is a bit like sleep apnea. Over time it can cause chronic stress which damages both the body and mind. Stress isn't just psychological. It involves hormones and the body's ability to build tissue.
Here's an article by my doctor, Steven Y. Park, that describes the symptoms of UARS:
You might want to consider seeing a sleep doctor who is familiar with both sleep apnea and UARS. Unfortunately, UARS can't always be detected by a sleep test. I get the impression (I may be wrong) that not many doctors are aware of it.