There's no need to worry about your bowels, 6 days isn't necessarily a problem for eating people let alone fasters. You are not piling the bowels full while they are not being used so there is no chance of blockage which is the main issue with extended constipation. I didn't use my bowels at all during my thirty day fast and felt no discomfort the whole time. They work properly afterwards so long as you break the fast correctly with soft water rich foods in any case.

Your high pulse rate is just a sign of a high rate of detox I'd think, or it could be that something the body is busy doing requires the increased energy use. It isn't unusual while fasting and like most fasting symptoms shouldn't last too long.

Well done getting through six days. :)

Andrew.