For the past 2 nights, my 6 month old Siamese has been going around in circles under my bed while meowing to the top of his lungs. I mean he's very vocal as it is so you can imagine. I looked under the bed to see if it was something that was catching his attention but there was nothing. He's been very edgy lately and is not eating how he usually does. He's eating but not all his food like he normally would. Last week he also sprayed my bed (at least it smelled like it). He's going to the bathroom fine but it's this behavior that has me concerned. What could it be?