It depends on how much you value your job & just how anxious you get when flying. I always try to avoid the Flight Doc like the plague, if the plague was still around.
In lieu of seeing the Doc, I would:
1. Think positively (always helps me)
2. Have a couple drinks @ the airport prior to boarding
3. When in your seat, point your eyeball vent directly at you & make sure it's open all the way
4. After takeoff, watch a movie on your iPad/computer, preferably a comedy
5. When the drink cart comes along, have another drink.
6. After movie, listen to some classical music, while thinking about how sweet your TDY is going to be (or not be)
Good luck buddy, I'm sure you'll do alright. Be very cautious with the Flight Doc though, it's a crap shoot to which route they want to take to get to the bottom of your anxiety.