I would suggest this plan, divide and conquer.....Now that you have your own room, organize the heck out of it. get all your thread together, sort thru every supply and notion you own, sort and organize. All you rotary cutters in an organizer. Then I would go thru all (every last piece) of fabric, sort by color, fold, put in plastic bins.....All your patterns together in binders.....Then and only then go thru your UFO's...there are going to be some you love and some you will wonder why you ever started.....Sort, keep the ones you love the most favorite on top, consider giving away the ones you hate either to a charity or the Goodwill (some one will pick it up and finish it).....
Then and only then, start a brand new project. Pick a new pattern that is something you have never ever done, perhaps go buy just some new fabric for it and use some from your stash, the shopping expierence will be much needed therapy.....Tell yourself you are going to start and finish this one project.....set aside a time of day, perhaps after lunch and before dinner..... This should get your juices flowing....If it doesn't walk out of the room, close the door and wait for the day when you want to go back....it will come ....just give it some time