Has anyone tried going to Mayo Clinic or Cleveland Clinic?

I have had migraines for nearly 30 years and they’ve been chronic for about 10. I have a wonderful husband and four kids and stay at home with my kids-basically the life I always hoped I would have as an adult. However, I am always in pain to some extent so my quality of life is garbage. I have been seeing a great neurologist for 10 years, but she just left the practice which delayed my Botox by a month and sent my head into a tailspin. My husband has been encouraging me to seek another opinion, preferably from Mayo since they are so large and well known, but I am hesitant since I have spent so much time and money seeking answers(to no avail, obviously) and we don’t live anywhere near Mayo so it would be a multi-day trip. I wondered if anyone here has experience or suggestions about seeking treatment at a larger clinic. Thank you!