Stall... and Then Keep Moving Forward

I feel stuck right now. I start to sing. But I haven't felt like I can put my all into it for a couple weeks. And I can feel it slipping. Like I can't get the same range and tone. Or volume and power. It's like my heart isn't in it right now. But I want it to be so bad. But its not just singing.

Its like I can't put my full heart into anything right now. I'm still working at things, I haven't dropped the ball completely. I'm still trying to blog, and I adore my family. But it feels like there are walls blocking me putting my full passion into the things I am doing. I haven't been relishing and enjoying it the way I was before. I don't feel the self expression like I have been. I don't know if it is just unrealistic for me expect to always feel so much heart and passion in the things I do. Things I love. But I want to. I believe I can. So why? Why does this happen? Why do I so quickly go from feeling so much is going into the actions I take to feeling so blocked up?