unable to focus

The biggest issue I'm having is staying focused on work. I'm self-employed, trying to start my own business (partly because I love what I do, partly because I'm just so frikkin' tired of job hunting and getting nowhere fast - not helpful for my depression either), though it occurred to me that starting a business while dealing with depression wasn't the brightest thing to do. Oh well, I'm determined to move forward now.

I will have good days, where I can get a lot done, I'll pick up some momentum, and will be able to keep at it all day. Other days I get sucked in. My head will be in a fog, and I won't have the energy to do anything but surf the net all day, or go back to bed. If I try to work when I'm in this state, I'll get myself really confused or I just won't know where to start (usually once I have a good day, I'll look back and think to myself, "oh yeah, I should have just done that - that was so obvious"). Sometimes I'll try stepping away from work and going for a walk or a swim. It ends up being a hit-or-miss type thing, sometimes it works, sometimes not (though swimming does seem to be more effective than walking).

What else can I do? The lack of focus and the confusion is really getting to me, I lose whole days, sometimes a week at a time due to this!

I cant really say much about motivation as i lack it alot but i could suggest checking your diet and see if that helps some.
I had a whole nervous breakdown related to my diet, since then ive seen another side to depression and anxiety that i didnt know existed.
I sympathise with your work situation.Its hard going at the moment with so few jobs going now.
Also if motivation is a problem i hear Cognitive Behavioural Therapy can be effective with alot of people.But alas i should practise what i preach on that one lol

I'm having the same problem with school. I missed my classes last week because of it.

My best motivation is external. I need to go because the sooner I graduate, the sooner I can move out with my boyfriend, etcetera...

Maybe if you can find a reason to stay motivated, you'll be able to focus. At least enough to function