I have certainly gotten that Supercharged Rush from juice, particularly vegetable. I don't have experience with wheatgrass, it not being reeeeel available in my corner of Sunny Mexico... but I would say you got almost a caffeine rush going there!
As long as you settled down, I wouldn't be concerned. It would be interesting to know if you have any further episodes, and what juice causes it!
Innnteresting combo of fruits! I am particularly enjoying my fruits this trip, and in the past I have leaned strongly toward veggies. Hmmm. I definitely am getting the cleansing action, still seeing solid waste here at day 7!