I do!
It can be very miserable. I've been suffering with both since I was about 12, but was only diagnosed with PCOS when I was 19, and endo when I was 23. To be honest, I have found my PCOS to be relatively minor in comparison to the debilitating and excruciating pain and suffering that endo has caused me. It really has disrupted every aspect of my life. However, I am a lot better now after having a course of very strong injections (Decapeptyl) to remove the oestrogen from my body (temporarily) and so shrink the endometriosis. Before that I could barely leave the house, couldn't attend uni very often and couldn't work for the pain, depression and fatigue. I am far better than I was, but I do have moments where I feel bad.
PCOS-wise, I find that taking the combined pill helps control my symptoms (which are less troublesome than when I was in my teens), but I do still get acne and gain weight just by looking at food!
It is thought that endometriosis is present in certain PCOS women who are susceptible to the condition, partly due to the increased oestrogen levels caused by anovulation (lack of periods). However, more research has been done which suggests that endo woman have too much of a particular enzyme in the womb, which starts the growths outside of the womb.
Some endo women are extra sensitive to oestrogen, therefore taking the combined pill isn't possible. A progestogen-only pill, depo injection or implant can be much better, however these aren't suitable for PCOS symptom control. If you can tolerate the combined pill, taking 2-4 packs back-to-back then having a 7 day break can help with pain, bleeding issues, and control of endo growths. The more periods you have, the more the tissue breaks down and reforms elsewhere, causing the added pain. This is fine to do with PCOS too, because when you're on the pill, your womb doesn't build up as normal, so you don't need to shed the lining as frequently as when you're not on the pill in order for it to stay healthy and comfortable.
Personally I prefer using a combined pill as it gives better cycle control, I can take packs back-to-back (which can also improve acne and reduce headaches and other problems) and I feel happier. I have tried Cerazette progestogen-only pill twice in the past, and although it was alright, I bled constantly, causing immense pain.
With regard to your treatment, make sure you're pushy. It takes years to get a diagnosis, and you need to be given good advice and help. Depending on the severity of the endo they found, they will probably tell you to take the pill how I've mentioned above. Since you have endo, they most likely will offer you a pill such as microgynon or Lo-estrin 30, but these will probably make your PCOS symptoms worse, therefore push for an anti-androgenic pill such as Yasmin, Cilest (recommended for endo), Marvelon, Femodene (recommended for endo) or Brevinor/Ovysmen (recommended for endo).
Hope this helps. Feel free to ask me any questions as I have been through a lot with both conditions and know my stuff!

xx
A really fantastic website, like Verity, but for Endo is
http://endometriosis.org.uk/