Ending day 13; depressed

I am going to bed now, at the end of my 13th day. 13 days. wow

Anyway, for the last few days I've had and increasing feeling of depression, perhaps linked to a decreased caloric intake? Who knows? Anyway, I wonder if any people who are experienced at doing long-term fasts have ever experienced anything like that.

I'm feeling horribly unmotivated to do anything and it's like I could just stare at a wall for 6 hours and not move. I had this idea of going 20,30 or even 40 days after I got to day 10 but now I don't feel sure of anything.

I am very attracted to the idea that the body can heal dramatically in long-term fasts but right now I don't feel very well.