Hi. Beginning of last week we noticed my cat could barely open his eyes and he had some strange liquid coming out of them. Then couple days later he comes back with a clogged nose with snaught and bubbles coming out. We also might think he has a fever but his body feels warm. And 3 days ago he started gagging really loudly, and this type of gagging sounds like someone is blowing their nose or dry coughing but isn't throwing anything up.. What could this be? We are really worried about him. He is a indoor/outdoor cat.