According to the Heinz Prechter bipolar study:

Migraine headaches were found to be more frequent among BP compared with controls (31% vs 6%; odds ratio (OR) = 3.5, 95% confidence interval (CI): 2.1–5.8), with greater risks associated with female sex, increases in measures of severity (earlier onset and greater frequency of mood episodes) and a history abuse or neglect.51

Cohort Profile: The Heinz C. Prechter Longitudinal Study of Bipolar Disorder

So yeah. They are really common with bipolar and bipolar type disorders. I get them too. I started medicine for them and it helps A TON though. I couldnt believe how much it helped. Might be worth checking out for you too.