Not in sync with body anymore. Looking for motivation.

I did all the right things to take care of my body and my baby. But now that she's in this world and I'm no longer nursing, I find that I have no motivation to take care of myself. I eat poorly, I don't drink enough water, I don't take a multivitamin anymore, and I don't work out (the best I do is take a walk with the stroller every now and then). My body is so out of whack. I'm no longer in tune with my body, all I feel is pain/weakness, which is my body crying out for help. But I can't seem to get back to myself/my zen/back in tune mentally and physically.

Does anyone feel the same way? And do you have any pointers for how to get your motivation back to get back in sync and taking care of one's body?

It's like I ran a marathon, and I've hit a wall. I spend so much time taking care of my family, that I no longer want to take care of myself.