Lethargy and not feeling well are part of the detoxifying process. I'm surprised it didn't kick in sooner for you, but by the fact that this is Day 8 it seems you're doing what you said you would do: taking it slowly.
I'm a member of a fasting forum (yes, really!) and saw a thread in which members seemed to agree that it was best (for most working people) to start a fast on a Thursday, because days 3 and 4 are the worst. It's a positive sign but feels like hell at the time...
so...
I'm obliged to tell you that the last time I began a fast, I aborted on Day 1 because by the afternoon it was either kill my husband and myself
or make a cup of coffee to have with a cigarette.

I understand that I've got a
lot of toxic build-up and it will only get worse the longer I avoid doing anything about it.
desperate788 wrote:But as a wise outside observer...
I don't think I'm that. I have quite a bit of fasting experience and I know what works for me and what doesn't, but you're the best judge of what goes on for you. I'm just reminding you that your clothes felt a bit looser and you were feeling stronger and more optimistic. That's what it's all about, and that's what you'll have more of if you can stay with the program.
The bad stuff will pass and you'll feel infinitely better afterwards, but only you know how much you can take. Please be kind to yourself.