In my opinion (not having a medical degree!
), you do sound clinically depressed.
I've been on anti-depressants for 13 or 14 years, and I would never go back to being without them. I take them for all the behaviors you mentioned - not able to sleep, short tempered, complete inability to focus, feeling dragged out and apathetic all the time, etc. etc. When I'm not on them, it's like everything is way way too much work. One of the hardest things to understand about depression that on the outside it looks like you should be OK, but inside you're a mess.
Talk therapy can be very beneficial, but if you're so depressed you can't focus it's hard to accomplish a whole lot.
I would suggest talking to your doctor about them. Be patient because it may take a couple of tries to get the one that's most effective for you.
You are definitely NOT alone - please let me know if there is anything else I can do to help!