When I get overwhelmed by all of what's ahead, I try to make a list of them - the projects, the tasks, etc. It doesn't matter if I don't get them all on there, just the better part of them.
Then, I label the tasks either A, B, or C, with A being the ones I want to do first.
Make a second list of the two or three top "A" items and work from that. You might want to do one at a time or alternate between them, but stick to your list. If you get one done before the others, replace it with another "A" item from the main list.
I take my two-three item list and put it up on the bulletin board or somewhere where I'll see it each day - keeps me focused.
Then, if I want to play on the computer, at least I know what I'll do when I get back in the groove.
Might be a silly little game I play with myself, but somehow I get more done this way.