Joyless appreciation?

I know my mood lately has been less than upbeat. I have had so much on my mind lately. Life has been going by at such a breakneck pace and it's hard for me to take it all in sometimes. I feel like a '78 Pinto getting lapped in a NASCAR world.

One thing I keep going over is the relationship between joy and thankfulness. Although I feel I have been losing some of my joy, I still feel very thankful. I so appreciate all that I have been given- salvation, my wife, my children and family, my health, my home and life, and even my job...sort of.

I am thankful for it all. I know I am. For whatever reason, it just has not given me much joy lately. It's a wierd feeling. At first thought, these two ideas should have a positive correlation. As one goes up, so does the other. You would think. I guess I'm just not sure.

Thankfulness is not listed as a fruit of the Spirit in Galatians 5, although joy makes the number 2 spot. After some examination, I can see a relationship between joy and hope according to Romans 12:12 and Romans 15:13. I haven't come across a similar relationship between joy and thankfulness yet. Should thankfulness inspire joy? Here are some things I have found out about joy for sure:

-Jesus had it
-Paul had it
-fruit of the Spirit
-you can lose it
-something we should always be full of
-can be filled with it by God
-things can give it to you
-it can be complete
-you can do do things with joy

I know I need to get some joy back. I guess I'm just in my annual winter slump. Joy and thankfulness...what are your thoughts?