Sammyr I've had endo since my early 20's. I had several laparoscopies over the years to treat the endometriosis - get rid of the lesions. Have you not had this done? If you have adhesions, surgery can help and rectify those issues.
I was never offered an ablation as it is not really the standard of care for endometriosis here in the US (least that I'm aware of). I had cramping so badly I'd be gripping the edge of the table to get through the waves. The surgery helped a lot.
I was warned by the specialist when I began HRT to be very careful (I'm 52) as it can reignite any endometrial lesions. I've stayed on a very low dose for that reason as it quieted down considerably after peri.
If you haven't discussed laparoscopy for more complete treatment of the endo, I'd suggest it. The only way they can actually visualize endometrial lesions scattered in the pelvic cavity is by laparoscopy. This is if you really do not want to go the hysterectomy route.
I totally feel your pain. My endometriosis, though mild as staging goes, gave me horrible, horrible cramping. xxx