Possible Clues:

• A really nasty headache
• Aircraft drop explosives initially in attack
• Headache caused by rig collapsing in US state
• Neurologist's concern
• It's a headache as I dash into myself!
• Queen's piercing version of 'Imagine' -- headache!
• Military plane almost came down, creating a problem for the head
• Recurrent severe headache
• Changing gear with Mini's a headache
• Severe recurrent headache