I am on Colonix day 15. I too have a tendency towards depresssion, and i have also noticed very low energy and a low spirit. I have moments where the clouds clear and i feel all interested in things, then i get feeling low again. I have no doubt it is the cleanse, adn i am looking forward to the good work it is doing in me!
I have not noticed having the other symptoms you mention, but then again i did not have them before the cleanse either.
You are almost done with round one, keep it up and see what happens during your 5 days off.
Best of luck!