I would suspect reflux provoked by walking around after taking Boniva. To discourage reflux avoid exercise, clothing that is tight around the middle, bending over to pick something up or just bending forward.
If the pain is caused by reflux, you may want to consider if you are vulnerable to reflux, ulcers /and or boniva.
Consequence of repeated episodes can be serious with degradation of the esophagus, ulceration of the upper digestive tract. You might inform your physician. I think ibandronate is still available as a 15 minute infusion every three months.
But then again, (as in don't take my advice) I would have been taking the taxi to the hospital, thinking of my heart.