There may be ways to manage your symptoms and pain, but surgery is the only way to get rid of existing growths and the various hormones (I.e. Progesterone only, no estrogen) will help to prevent it from growing.
There is a medication that I found out a year ago call Endovan but my doctor doesn't recommend it, but I'm not sure what to think. I have not heard of other treatments, I've heard of woman doing Yoga, physical therapy, changing diet, and trying other hollistic options, but I am not such a believer... I also have known of something called high intensity focused ultrasound which isn't surgically invasive, they use it for rumors and cancers and other things like that I've done some research and it's very effective according to research, it's suppose to burn away diseased or damage tissue through ablation. According to some research you can find online for treatment of endometriosis, they have success on the treatment.
No. Are there holistic ways of managing the pain combined with both? Yes. But you can't actually be diagnosed officially unless you've had surgery-lapriscopic or a laparotomy.