My 19 year old kitty was out of sorts this past Monday and didn't eat/drink much. That was concerning b/c he LOVES his food! I called the vet. She thought it was upper respiratory and prescribed Clavamox. He ate a tiny bit of tuna juice/tuna that night. The next day, he seemed back to his normal self and eating/drinking fine. His eye is a teeny tiny bit more teary than usual (he's a white cat, so always tears), no coughing, sneezing, etc. I have seen some brown cat "boogies" in his nose the past week or so. My question is: should I give him the med. (of course, all meds have potential side effects), or should I just continue to keep an eye on him since he seems back to his old self?