I have endometriosis but don't want a hysterectomy, help!!!!?

I have been treated for 2 years on and off with prostap injections for endometriosis. Other than a mirena coil I would have to have a hysterectomy. I don't want either, Can anyone suggest anyway of coping with the unbearable pain that I experience each month or suggest an alternative treatment that works? I am so terribly ill each month with this condition then as soon as the period finishes I am back to normal like nothing ever happened. It's just hell to live with.