During the lows (even when a funeral doesn't figure prominently, my condolences) on a juice fast, is a good time to consciously pamper yourself. Listen to some good music, while experimenting with new juices, new tastes... Maybe read some inspirational material... write in a journal, work in your garden if you have one. If you don't maybe plan one, even if it's a container garden... Taking care of yourself spiritually, while on a juice fast, truly helps during these lows.
Here's a link to some great articles on juice fasting, including one that explains the highs and lows of fasting: http://curezone.com/blogs/m.asp?f=573&i=78
Here's a link to some great recipes: http://curezone.com/blogs/m.asp?f=573&i=97
And here's a link to a 30 day juice fast journal: http://curezone.com/blogs/m.asp?f=573&i=98
Maybe you can gain some information, tips and tricks and inspiration to help you along your journey...
It won't be long before you begin experiencing some of the beautiful highs on a juice fast. Remember you aren't depriving yourself when on a juice fast, you are giving yourself a gift of life. Just hang in there, stay strong, stroke your spirit, pamper yourself... you'll get through the lows and come out on a high.
I wish you the best,