I was wondering about this, because there is a possible scientific link between the two conditions. I was diagnosed with PCOS after years of struggling with my weight, irregular/non existent periods, acne and depression since the age of 11. So my diagnosis came at the age of 19 after lots of tests and paying for private consultations since my GP was dreadful. At the same time, I have always had very painful periods, pelvic pain and low backache. These symptoms became worse by my early twenties, and I was eventually referred for a laparoscopy, which confirmed endometriosis. I then went on to struggle on the combined pill, had a course of GNRH analogue treatment (Decapeptyl) which helped. Now back on the pill but have had a stress-induced endometriosis flare-up since July (not having a good year

So, although my PCOS seems to be kept at bay by my use of the combined pill (ok so I'd like to have better skin and be able to lose weight as easily as everybody else without having to limit myself to about 400 cals a day!!), my endometriosis is and has had much more of an impact on my life.
Who else has the two conditions, or suffers with endo symptoms but hasn't been diagnosed? For your info, symptoms include:
Severe Period Pain
Pelvic pain
Leg Pain,
Back Pain,
Nausea,
Fatigue,
Diarrhoea,
Bleeding from rectum
Bowel spasm
Constipation,
Swollen Abdomen,
Heavy or Irregular Bleeding,
Pain During Urination,
Painful Ovulation,
Painful Intercourse,
Painful Orgasm
Infertility
You may only get a couple of these, but as you can see, there are many nasty symptoms.
Hope you're all having a good day xx