I’m so sorry to hear that you have been struggling with endometriosis plus something else. I work with women who have chronic illnesses; most of them have autoimmune diseases. It’s so discouraging (for both of us) when doctors suggest that the pain is in their head. Time and time again, after the doctors get it and validate that there is something wrong, that my client is sick, the validation is a bittersweet experience, just as you described.
Continue to take care of yourself.