I do this, too. For me (and it may not be the same for you) from week to week when things are 'normal' I don't worry or panic because I 'know' where T is - even if I don't know exactly where she is or what she is doing. I 'know' she is in/around the city, going to work, coming home, doing normal things. However, when she goes away for a time and I don't know where she is or what she is doing - it's much harder for me. I think it's just that imaginal 'knowing' that helps me. The times that she mentions where she is going when she goes out of town I don't worry nearly as much as I do the times I don't know because I know where she is. It's weird, but you aren't the only one. I know it's hard.