Welcome to the club!
Orange juice, if straight from a sealed bottle, is highly unlikely to have gluten or soy, but it can irritate your stomach because of the acidity. 6 years in I still have trouble drinking too much orange juice because of the acidity (I get gastritis on occassion and acidic things are no help).
Great to hear your feeling a difference on such a short time gluten-free (I was the same), but be aure to treat your stomach very gently for the first while. It's going to take some time to heal, but if you know what to do from the beginning, it will be much easier.