Uterine fibroids and migraine are both common in women, so it is common for someone to have both problems. Additionally both are influenced by hormones and both often improve after menopause.
However, they are usually independent disorders and treating one will generally not influence the other.
There are exceptions. Fibroids can manufacture prolactin, the same hormone secreted during breast feeding. Therefore it may be useful to have an endocrinologist evaluate someone with intractable migraines and disabling uterine fibroids.