cat started acting lethargic yesterday. There was vomit in a number of areas. It was a foamy white residue. Had trouble standing and was staggering when trying to walk. He urinated in the cat box after we feed him water with a medicine dropper. he is not eating anything and it doesn't appear drinking either. wouldn't even lick tuna off a spoon. he appears to be in better shape but still out of it. our suspicions are tick bit , old age, or ate a perscription headache pill that may have fallen on the ground. he is a 11 year old neutered male. traces of black around one nostril. blood? recent weight loss