Hello,
If your migraines were in some way related to your menstrual cycle you may find an improvement after removal of your ovaries. If not, there is no telling if there will be any impact at all.
Regarding your surgery, I suggest you speak with the surgeon who will perform the surgery about what to expect in terms of how it will be performed, length of stay in the hospital, need for post-op pain meds, potential complications, recovery time and how you will be followed thereafter.
Best regards,
Dr. Downing
Upon further research, my upcoming surgery is more accurately referred to as "radical hysterectomy" rather than "total hysterectomy" - just for clarification