Are you sure that is what it is? There are illnesses that have the same symptoms of coughing and gaping. I've never heard of them getting things stuck in their throat I must admit. Grass spikes if too long can create impacted or sour crop, but don't think they cause those symptoms. Sorry can't help - not had any couching or gaping except in a bird that was obviously ill, and demised pretty quickly. Not coccidiosis though, wrong symptoms.