Honestly speaking your pains talk by themselves and no need to just wait for your diagnosis to know that you should make some changes in your life. Even if you do not know if you have endo or not, most of the pains you described are usual in woman suffering from endo. There are different ways to treat the pain, but so far what I have found from my readings on the topic we should avoid painkillers most we can. I usually keep it as a last resource to tackle the pain. I do different natural approaches to help with pain. So this is only a support to you normal treatment. Some of the ways to help with pains are lifechanging. As changing your diet (avoid wheat and processed food the most you can), adding supplements (as for example magnesium helps a lot with pain, you can try baths etc if you do not want tablets...but magnesium baths help a lot and relaxes you), try to avoid stress (meditation or any other activity that you relax and pay attention to yourself helps a lot), add some teas (tumeric and ginger tea, bay leaves, chamomile, rosemary, these are some teas that help), avoid coffe and caffeine drinks (try dandelion instead, it helps your liver clean up the excess hormones and toxins), and try to avoid toxins in your diet and cosmetics (dioxins, parabens, etc). Try a compund approach...different techniques to actually get results, and save the pain killers for the worst moments because if your body gets used to it the it'll stop working for you, besides that it is extra toxins to your body.
These are just some tips that will benefit you in the long run. You can always try to read books on the topic. I read some good one. I really liked the "Endometriosis: A Key to Healing And Fertility Through Nutrition" by Dian Shepperson Mills because it explains everything you need to know about endo, diet, lifestyle, and supplements. I am still reading, but I also liked Heal Endometriosis Naturally: WITHOUT Painkillers, Drugs, or Surgery by Wendy K Laidlaw, it is like a summary book about different things you find about the topic. I did buy the "Living Well with Endometriosis: What Your Doctor Doesn't Tell You...That You Need to Know: What Your Doctor Doesn't Tell That You Need to Know (Living Well (Collins))" by Kerry-Ann Morris but didn't read it yet, but it has different things to help you diagnosing and finding the symptoms etc.
Hope this helps you.