Here's a place to start...
In your next few sessions of free time, open up a text file or physical notepad, and proceed to just write down all the things you are interested in doing in life. Don't worry much about the structure or how it's done. Be creative. It can be lists, paragraphs, sentences, mixtures, and so on. Make side comments, draw pictures if you're feeling that. Just get it all out in brain dumps over several sessions. Don't limit yourself to "side projects". Include things like exercise, recreation, learning, social desires.
This brain dump will allow you to empty and relax your mind.
Next, begin to think about organizing with an aim toward finding the next 1-3 things that you want to prioritize. How you prioritize is up to you, and very personal. Accept that choosing to prioritize thing 1, will mean deferring things 2, 3, and 100.
Finally, in the next session, switch from organizing to doing. Just do a small task or activity related to the top priority.
Do as many implementation sessions as you like. When you start feeling scattered and anxious, go back and spend some time organizing.
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The big picture...
As a part of this process, begin to recognize how this organization time is legitimate work. It's the prep work, the executive function time, which you do before you start implementing. It's a never ending loop of organizing and doing.
Additionally, recognize the brain dump and wherever you keep all these notes, is your external reference store. You don't have to walk around with all the ideas and goals in your head now. You can relax and focus on the top few priorities, and return to your written notes as needed.
If you want a more structured variation of this, read and try the Getting Things Done book and techniques.
