I was diagnosed with endo in 2000, as the GP had suggested it I had a google at the time and like Attila recommends I wrote a detailed history to take with me to the consultant.
This included when I started my periods, what they were like, I kept a diary of pain and where the pain was (lower back, ovary, generally in the abdomen) and I could see a pattern emerging. I had been fobbed off for years by male doctors who just told me I had painful periods and get on with it.
Consultant did internal exam which was painful if I am honest, due to the feeling around involved, he had fingers inside me and was pushing on my abdomen to feel around. I had cysts on my ovary and womb and so was sent for a scan.
Started meds, pure progesterone to begin with then full on fake menopause for 6 months including HRT. Was not enjoyable but was prepared to do anything to help with the pain. I had acupuncture, drank disgusting Chinese tea, overhauled my diet etc. My endo was very aggressive.
Finally got a laser lap and dye (where they put dye through your fallopian tubes to see if they are blocked) Was told at that point children would be a struggle to conceive without IVF, they didn't even know if one of my ovaries was working because it was so scarred with endo deposits as were my ligaments on that side of my body.
But I did conceive naturally and in a very short space of time, and had another baby 3 year later. Despite all the medication at the start, I am pretty much pain free, apart from ovulation and 2 days of my period, I am well, but I do suffer from fatigue, but that is preferable to pain.
I never would have thought that 14 years ago, when I was crawling on the floor writhing in pain and feeling like I would pass out that I would be pain free at some point. So although endo can be hard to control, it can be dampened. And knowledge is everything, the second I come on my period, I know that pain is coming, so pain killers back to back and a period TENs machine get me through.
I haven't had the minerva coil but my friend has it for her endo and gets along well with it.