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Jen...
What was your previous longest run in the past? 3 miles? 4 miles?
You really need to build up your mileage SLOWLY. You don't just up and bench 200LBS if the most you've ever lifted is say 120LBS. :) You have to slowly increment things. I think the general rule of thumb is never increase your longest run any longer than 10% per week.
I suspect you simply haven't built up enough to be out running that sort of distance yet.
Also, how many times are you running each week?
Here is Hal Higdon's 1/2 Marathon training schecule.
I would count back from the actual 1/2 Mary and fit the schedule in appropriately. You would start the schedule on the 1st... (shift the days of the week around to suit your needs) And prior to that I would simply repeat weeks 1 and 2 from now until you actually start the schedule. That will be a good warm-up for you.
Good luck, and don't hesitate to search google.com for 1/2 marathon mileage build-up
:)
Trae
Fitgeek.org
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