I'm the other way around, I feel more confident towing my babies and I'm a nervous wreck as soon as they get into the trailer with somebody else behind the wheel, this started after my mum took a corner too fast with Mitch in the back, and he scrambled and managed to unhook the partition and roll the mat under his hooves, he also took the skin off his hock and just above his hock, I think I was more shaken up than he was!
A good thing to do is keep a cellphone with you, let somebody know what time you plan to be at your destination, and keep them informed of where you are, if you stop, if you have any problems. That way if something does happen and you are on your own, somebody will know, and if your not at your destination at around about your expected time, somebody can check up on you.
Or if your destination has no cellphone reception, let somebody else know what time you will be leaving, somebody who is going to the destination before you, they will then know about what time to expect you to arrive and can even go for a drive to check your whereabouts if you don't arrive on time. I've hauled through some pretty scary roads on my own, I'm 18 and my horse has always been trucked up until I got him, so he doesn't quite have the most amazing balance in a float just yet.
Other things you can do if you are worried, say about cars behind you getting too close, is to get a remote controlled LED sign that you can preset messages for and press buttons to change the message. You can preset messages such as "Will pull over when safe" and "nervous horse/driver on board"
And practise, the more times you get out and have successful trips, not matter how short the trips are, the less likely you will be to have such high anxiety levels. I always find that my journey back home is easier for me than my journey to the destination, especially if it was my first time driving that stretch of road.
R.I.P ~ Bubbles - 25yo tb mare - 13.04.2011 ~ 8:30am ~ passed away naturally and peacefully in my arms