Why do I have a bad headache after day surgery?

Yesterday, I had a G-tube (entristar feeding tube button in my stomach) removed. They put a lot of freezing in the area around the button and after they took it out I felt really dizzy and faint. They put some stitches in to hold the hole together since I have had it for 13 years. Now, I blame the dizzy faint feeling on my body absorbing some of the freezing. But, that night, and the next day (which is today) I have had a headache in the front part of my head. Do you think that could have something to do with the freezing? Or something else from the day surgery? Or perhaps it isn't related at all?