The Tower Card is the card you need to pay attention to when things in your life are about to shift in unimaginable ways.
Whenever I'm doing a reading for myself, sometimes the Tower card pops out. It's the card of destruction and it will clear everything in its path if need be. However, just because something is being destroyed doesn't mean that's a bad thing.
When this card appears in my personal readings, I know that there's something in my life that needs to be torn down so that I can do what I need to do in this lifetime. The Tower card in reverse is a even better sign (in my opinion). It lets you know that whatever had to be destroyed has now been cleared away and you can go about you merry way. There will always be a disclaimer with this car. Disclaimer: Just because something was destroyed doesn't mean that you go backwards.
Always look to the surrounding cards in your spread and remember that the Tower card is not meant to be the bad guy of the Tarot. It's just a reminder that endings make way for greater beginnings.