2.headaches have space to move, and heads are comfy and nice.
3. "neither has as much room as I," "I've lived in the best heads," and "I can move into a head at any time"
4.asprin
5. Advantages of being a headache
6. the essay is quite literally about being a headache. The title would help readers make inferences (which means a conclusion reached on the basis of evidence and reasoning.) about what the story is about.