I am sorry to hear about your challenges. It sounds really tough.
re: "and I did an enema, but I don't know how often how I can do that to stop the build up of toxants in my body during a fast."
What kind of enema schedule have you been on? Have you done many over the 16 days?
As a means of rinsing a ton of toxins out of the most toxic part of our bodies (that last 6 feet), I consistently do 2 enemas per day on a Water Fast (12 hours apart) and it seems to work very well. I believe 3 per day (one every 8 hours) would be even better.