Night terrors???

i am experiencing a sleeping problem i've never seen discussed anywhere. this has happened to me off and on for several years and i've already had medical exams and gotten a clean bill of health. what happens is this: i go to sleep without any problem, but then wake up within one hour, Feeling extremely ill, nauseated, faint. i get out of bed and get some ice to put on my head and within 10 to 15 minutes it settles down. then i can go back to sleep and it doesn't happen again that night. i can go for months at a time and be fine, and then it will kick in with a vengeance and happen every night for maybe a couple of weeks or more. the pattern of sleep and waking within an hour is always the same. and it only happens when i'm alone. i'm assuming it's emotionally related, but that doesn't make it any easier. Has anyone experienced this, and what did you do for it? Thank you.
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