Possible Clues:

• Headache jet fighter mainly precipitated
• Russian aircraft drops explosives initially in attack
• Shimmering in image around retina's start — of one perhaps
• Complaint from serviceman backed by Republican in US state
• I'm in gear that's outrageous -- a problem for the head
• Recurrent throbbing headache
• Sick headache
• I remain upset about grand headache
• Condition of Russian fighter's low grade after downpour
• Horrible headache