on day 20 of 40 day water fast

hi everyone, i'm looking for some advice. i am on day 20 of 40 day water fast. i've spent most of the fast in bed restless but not enough energy to get up and do anything. the few days that i did have a little spurt of energy i was worn out after only 30min - hour of light activity. is this normal? what are somethings you might suggest to make the next 20 days go by quicker? also i am strictly on water meaning no broth or juice but am wondering if there is anything i could do to boost my energy.

thank you:)