Wow, you have a very busy mind - I mean your mind is full of chatter, and this is going to be your first challenge - to calm down.
Stop thinking of your life and the changes you want to make as this HUGE mountain to climb. That's what you are doing now, and that is probably going to end up with you making yourself more anxious. STOP. Stop thinking so much.
Do one change at a time, don't try to do everything at once. Don't try to climb the mountain.
I suggest taking up yoga or tai chi along with meditation daily to relax your mind and body. Do this for a few months diligently, disregarding everything else.