Day 4 and feeeeeeeeeeeeeeling goooooooooooooood!!! Glad I am too.
Now on my last fast day five was hard for me in the middle of the day. My advice - stay in bed as much as possible watch movies and read. Don't use up the little energy you have.
I made the mistake on day 5 and gave up after it. I regretted that. I know now I could have hung in there. Hopefully tomorrow I can handle it better - fingers crossed for you and us all.