Boy oh boy...sounds like separation anxiety and that poor baby has it bad! Tilly is such a cute name. Maddie has separation anxiety to a point...she doesn't like to let me out of her site, but is very good about me leaving her when I have to. When she's home alone, she's in her crate and feels pretty secure in there. I did a search on separation anxiety and found this...thought is was interesting and pretty informative. Hope it helps answer some questions!!!
http://www.dogdoright.com/canine-seperation-anxiety.htm