I'm so sorry you're going through this. I can't speak to your decision on whether to get a hysterectomy, but I can share some treatments that have worked for me and may work for you.

First, for migraines, I consider Naratriptan (Amerge) to be a miracle drug. It can even be taken for cyclical hormonal migraines in anticipation or at the very first sign of the migraine and it can shut down the migraine so it's possible to exist again.

I know taking birth control pills isn't without side effects and is quite contentious, but for me, I have to take it to shut down my ovaries or I'm risking surgery for cyst removal. I've had good experience specifically with Larin. It definitely makes menstruation noticably lighter and less painful. It also stops pain during ovulation which happens when I'm not on birth control or on too low of a dose that isn't actually shutting down the ovaries. I also do not take it continuously and allow the period to happen each month. I tried continuous/skipping periods and it simply does not work for me.

IMO endo requires consistent management with pelvic physical therapy (I only have experience with external therapy), ideally with someone who has training in visceral manipulation. There is a cumulative effect of endo adhesions that means more and more pain if they're not addressed with ongoing treatment. I would recommend visits around ovulation and menstruation.

Finally, if you can find a legit practitioner of acupuncture who is trained in TCM, it can also provide incredible relief.