The only thing that worked for me was Tramadol - it got me to work and through the day without being doubled over. Heat packs helped a little.

My gynae said my endo was too extensive for him to be able to do and referred me to one of the best in the country - they actually did my surgery together. The specialist had a waiting list of over 6 months, but my gynae got me in earlier. The specialist told me it was the second worst case he'd seen in someone my age. So yep, go the best you can afford (we actually spent our first home deposit as we didn't have private health insurance, but don't regret it for a second), and do it sooner rather than later.