Baby Headache?

We have been dealing with Randy waking (screaming and crying) in the middle of the night for two weeks. At first I thought he might be getting an ear infection; ears fine. Then I thought it might be reflux; started giving med at night. Then I thought that maybe he was just being a rotten piece of cheese. But last night I gave him Tylenol and he slept through the night without a peep. This was the second time in two weeks and the other time I gave him Tylenol too.

Now I doubt that 1ml of Tylenol is acting as a narcotic; especially to a baby that has been on Fentnyl, morphine, and Valium in his short life. I think my baby may be having headaches and that dose of Tylenol of enough to take the edge off while he sleeps. I have to call neurosurgery anyway for his CT scan results. I'll be sure to mention this to them.