Around about this time of year my 3 yo male loses weight, his fur goes really lank and sheds a lot, he becomes really clingy and follows us meeowing from room to room. Oh, and he wees on random objects in the house 
Apart from that, he is "normal" in terms of eating and drinking. I know in Autumn his coat will become really nice again and he will fill out, but was just wondering if this happens to anyone else?