My boyfriend is 24 and has had several symptoms for four days now. He's had stiff neck, his body aches all over, dizziness, severe headache, and he's starting to become a little scatterbrained (the last day). What could be wrong with him? He's away at training for the National Guard and has been for the last four months. The day before his symptoms appeared, he was outside in teen degree weather for three days. Could this have something to do with it?