Examples:

• Every day I say i have a headache.
• Ow. i said i have a headache. stop yelling.
• Oh, i have a headache.
• I'm tired and I have a headache, that's all.
• I can't help taking painkillers when I have a headache.
• Go down and tell him I have a headache.
• I have a headache from all that screaming.
• All right, well, you start tonight, I have a headache.