LOL. The tail wag is a sign of annoyance but my two do that when they play too. I think it is just saying "Hey I gonna get you for that" but playfully. My two wrestle all the time and the tail goes 250. They never growl or hiss they are having fun but when one gets the better of the other the tail goes faster and it's on. LOL

I think a vet visit is in order for those runny eyes and sneezes and coughs just in case. Let us know what the vet says tomorrow.