Ah, I know this all too well. You will have to experiment with many different things- for some horses lunging takes off the edge and helps, but for others that movement can actually stimulate adrenaline and hype them up even more. Since lunging can be pretty mindless, it won't help your horse get his mind focused on you. Try taking him to a quieter area and practicing your pivots, backing, side passes, all things where he will have to stop and listen to you to do well. Don't get frustrated when he acts up though, because he will feed off it. Also, just calmly walking around to try and calm both of your nerves may help too.
Many horses will be calmer around the trailer, because that's most likely where all the familiar faces are. When you walk him away from the trailer, reassure him and give many pats, get a distance away, then make him stand. It may take him a few minutes, but the moment he stands quietly, even for a few breaths to begin, praise him and let him walk again. It's a form of pressure and release training that has helped my anxious horse at shows so much.
Good luck :)