It is weird. If you have never had a reaction to eating oranges before, I would say that it isn't an allergy.
Since you weren't exherting yourself, I wouldnt' say that it was from doing too much.
It could be from GERD, because shallow breath has been reported with GERD.
If it happens often, talk to your doctor, and by all means, if it becomes too hard to breathe, go to an emergency room.
Wishing you all the best...hope this doesn't happen again!
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Diagnosed with Generalized Anxiety Disorder (GAD) and Panic Attacks.
Clickable Link that may be of interest to some...as I find I often like to check drug interactions...Drug Interactions