Dry heaves while running

Question
I have been running for five months now.  I started in May with a 10 week program that took me from a non-runner to running for 30 minutes.  I made it through the summer months with the promise from running friends that when the weather cooled, running would get easier.  The weather has cooled but lately I have started gagging when I get tired.  It is more like dry heaves.  I end up having to stop because I am gagging so much.  Why would this start now?  It is not like I am running at a fast pace.  I am running 5K at about a 12 minute/mile pace.  I am very discouraged by this.  Any help would be appreciated.

Answer
Hi Rhonda
To give you some answers i need a little more info such as height, weight, age,food intake, breakfast, lunch, dinner.water consumption,when you run,time of day,and last,how soon do you run after you eat.Were you a smoker?
Get me this info and we can pick it up from here.

The best to you

John
www.rentacoachinternational.com