I guess I don't associate caffeine withdrawal headache with migraine as I don't generally get migraines but tension headaches instead.

The caffeine withdrawal felt like my head was imploding, if that makes sense. Not sure if that's a migraine or if opioids were making it worse, but the Vicodin I was prescribed absolutely had 500mg of Tylenol in it; and only 5mg of hydrocodone.

A week of this was terrible and it did not improved. I have sense learned to moderate caffeine and often drink tea instead of coffee or even decaf or halfcaff when I want to cut down. I will never try to cold turkey it again.