Your bird is definitely vomiting, not just "affectionate" regurgitating. Keep an eye on its weight every morning, and if it's in steady decline, the bird could have a yeast or giardia infection. Alternatively, it could have swallowed something it shouldn't have. The bird's weight will be the earliest and clearest indicator that something is wrong. By the time the bird becomes lethargic and visibly very ill, it's already a critical emergency. Good luck, I hope everything turns out fine!