Feeling flat, overwhelmed and tired

Help!  Where has my motivation gone?  I'm self sabotaging and it is making me feel so bad about myself.  I feel like a failure writing these words.  How easy it is to go from feeling in control and making a change to feeling like I am useless and unable to change.  It almost feels like I don't even want it.  I don't even want to put the effort in to make the change.