Extreme Pains Please Help!

I usually have pretty painful periods ever since coming off birth control in 2014 due to being diagnosed with Chronic Migraines, but my last cycle was the worst I've ever had and even collapsed from the severe pain while I was at work. I shrug it off thinking it was just normal pain but I was wrong, brought it up to my doctor and now I'm being tested for Endometriosis, so far something's been found on my left ovary and quite a lot of fluid on each ovary. There's something going on with the lining of my uterus but my ultrasound was hard to see so I'm currently waiting to see a gynaecologist. I've just hit my period again and the pain is severe, I'm lucky to walk. I was told to go to hospital by my GP if it gets as bad as my last cycle again but I hate hospitals for the pure fact I spend more time in waiting rooms than getting treated...so I'm at a crossroads. What should I do? Or is there anything at home I can try to reduce the pain?