Expanding.....yes, this is how it goes during the mourning process.....the emotion can seem to just rise up and envelope us...just out of the blue....
don't spend too much time trying to "rationalize" it....it is more emotional than intellectual....
As time goes on...as you establish new patterns and have new experiences...you will establish a new normal...
You will also notice that you will have memories, of course, but without the gut-wrenching emotion.....more like history than present
dandylion