Cat wolfs his food and is prone to vomiting as a result. However today, the coughing/retching thing hasnt brought up any food. He is licking his lips a lot and then coughing, bringing his paws to his mouth and and has spat up a wee bit of foam. Cant see anything in his mouth and hes calm otherwise, no fever, but keeps smacking his lips and swallowing hard. Vet tomorrow or wait?