Bless your little heart. It is going to be okay. We all feel that way sometimes.
Why don't you try being sure that you are getting your full 8 hrs sleep each night, spend some time in Bible study & prayer. Be sure you are eating fresh vegetables & fruit? Drink your full complement of water & avoid the sweet drinks, alcohol & caffeine. Make sure you get a little exercise, even if it is just taking your puppy for a walk. Stay away from the fatty, heavy foods that make you feel sluggish. Take a multivitamin, calcium & B12 supplement. I promise, try all that for a week or two and see if you don't feel better.
Usually it kind of sneaks up on me & then when I get back on track, everything looks better again.
Please keep us up to date on how you are feeling. Honestly, if you will take care of yourself physically & emotionally, life will be good.