I had major surgery soon after my dx, for adenomyosis (similar to endometriosis)

I needed to have a hysterectomy, and my ob-gyn first did a consult with my neuro, because she was concerned about giving spinal anaesthesia, as I have a plethora of lesions right in that spinal area where the anaesthetic would go.

also, my neuro pre-prescribed me a two-week course of oral steroids, as he felt that the surgery might precipitate an exacerbation, for me.

(this was back in the dark ages - 1992, and there was no IVSM or Imuran available.)

MS differs so widely between patients, that there's no way to guess what might be the case for you... and there has been so much research and new knowledge since then.

I did have a flare afterwards, but it was a small one, and over quickly, so I didn't even need the steroid course.

I wish you luck, and hope all goes well for you with your surgery.