Thick mucous (clear or tinted yellowish) in the back of the throat will prevent food items from being swallowed. It also sets up a chain reaction - the food item starts to deteriorate and this causes further bacterial problems.
We have seen similiar happenings - you need to clean out the mouth (and throat) if there is food there - get it removed. If you can't manage this, take your cham to a vet.
The likely scenario is a URI that is forming mucous strings, and this prevents the food from going down properly. It also makes it very difficult for the cham to breath through the glottis. This proves dangerous for the cham, so it needs to be tended to post haste. Most likely, the vet will prescribe antibiotics if there is evidence of URI - but you may elect to have a culture done - to see if there is another form of bacteria causing the mucous. We have seen several kinds, and not all respond to Baytril (the common antibiotic)
Keep us posted...
-----
