I think maybe you have answered your own question. Give yourself more credit
"I know it's good to be happy living everyday life (Ecclesiastes), but since I have no immediate obligations I don't know what "everyday life" is right now."
First part, spot on! Second part, I think maybe you are putting an unnecessary condition on the first.
This is the day which the LORD has made;
Let us rejoice and be glad in it.
Says nothing there about knowing God’s plan or knowing what the day will bring. So you don’t have a routine, or a plan? Embrace that. Embrace that every day is a gift from God full of possibility. Try not to be so caught up in looking for what you expect (I know I do this all the time) that you don’t see what is there.
Also, this may be odd advice on a to read on a forum with a gaming slant, but get outside in the sun. When I am in a funk, I find that sitting in front of the Xbox is often the worst thing for me. Try to find some place where you can be outside with God and just take a moment to look around at how amazing it is, how and how blessed you are to be part of it.