Interesting about caffeine helping. It works as a vasoconstrictor - constricting the blood vessels. It can be helpful with migraines, too, but too much can also trigger a migraine. Lots of things are like that with migraines.

From that, I'd also imagine with tinnitus similar things would help that help with migraines - like proper sleep, a sleep routine, well hydration, low stress, and avoiding triggers. Triggers for migraines can be things like types of food, smells (fake lavender does me in fast/hard and many other smells), bright lights, etc.