Focus on one thing at a time.
It's very challenging for me to focus also - I have a million projects going on at once. Therefore, it seems so overwhelming that it can be tough getting even started.
Why not write down ONE thing you want to accomplish each day? Let's start with your room.
For the next week, don't push yourself to accomplish anything else. Instead, everyday, do one thing to clean your room. Example:
Day 1 - Separate items in room to 3 categories: Keep, donate, sell, trash.
Day 2 - same as day 1
Day 3 - throw away trash items.
Day 4 - donate the donate items
Day 5 - mark up inventory of stuff to sell
Day 6 - put up ebay/craiglist listings for every item to sell
Day 7 - vacuum/dust room.
You get the point.