How can I decompress my photos in the Time Mode.

If you can, hit the "back" button until you can get things back the way they were.  Then make sure that you have not selected the icon that highlights everything (all photos, all music) when you click on something in the tracks - instead click on the one that allows you to manipulate a single object.  Shorten and fade your music track to match wherever you want in relation to your specific photos.

As I am not certain what in fact led to this, make sure you didn't just compress the view.  There is a bar that has a "+" at one end and a "-" at the other that allows you to quickly expand or compress your view.  Maybe you just hit this instead, in which case just drag the midline button to the "+" side of that bar.