Yes he did hack up one soon after he threw up the first time. This is probably true since he has been shedding a lot and shares a bed with his much more fluffy sister
My cat, Gilbert, is 9 years old and has been vomiting and not drinking or eating for the past day or so. He is also constantly grooming himself. What could this be? (Also I noticed the first amount of vomit I found had some plant life in it)