Well high intra-cranial pressure (ICP), in my opinion, can promote either tachycardia or higher blood pressure, as the body desperately tries to deliver sufficient oxygen to the brain, against this raised ICP.
For migraine, if by chance you are suffering from it, you ought to look at the ‘magnesium deficiency’ connection. In fact, in decades past, they used to give magnesium to lower high ICP (the cheap solution!)