Keep going. You're already 85% there. Why start over another time?
As long as you feel good.
I'd check with a doctor afterwards anyway, if you're training for a race. Your heart could enlarge anyway. It's temporary. But weight loss makes water around the heart sometimes. I don't think it's that dangerous as long as you monitor that.
Good luck. May I suggest a wonderful plan for after the fast? It's what I will be doing. It's called Jay Robb's Fat Flush Diet, shows you how to eat well and is actually for body builders. You would love the protein shakes which are the purest I've seen. Try it.