My 18 year old cat started gagging two days ago. I have another cat who was doing the same thing and he had a virus, so I took the 18 yr old cat to the vets. She checked the cat and says she seems fine. She thinks that she snorted up some water when drinking (wouldn't doubt it as she always snorts when drinking) and has some stuff in behind her sinuses which are making her feel not so great and that she is reverse sneezing. I noticed that when I pet her and she starts to purr that is when she does the gag / reverse sneezing. Has anyone else experienced this with their cats? I trust the vet because if she thought something else was wrong I know, from previous experiences, she would run all sorts of tests. I just haven't heard of this, but I did see cats on YouTube reverse sneeze and it seemed similar, my cat just doesn't do it as much as severe.