Endo flares suck, mine lasted about 6 months and basically I just sat on the sofa with a heated blanket wrapped round me… not the best advise I know but it kind of had to run it’s course, the flare happened because the supply of tablets I took which stopped my periods went very low and they couldn’t get any so everything which had been subdued came back. I am back now on another form of the combined pill which means no more periods so hopefully things will settle down