Seems like a vet trip is in order the noise and fluid expelled (mucus) are the signs of a respiratory issue (not what is commonly refer to as regurgitation), if it is the case (and based on your description it sounds like it) it would be an advanced stage that would need to be addressed ASAP (proper vet, mandatory culture, adequate anti-biotic treatment for no less than 30 days.)
You can slightly raise your temps 90 to 92 on the warm side if it's lower and raise your humidity which will help loosen up the mucus for now until you make your appointment.
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