Yep, I had those same thoughts was I going to die, but now I realize I had so much toxic in my body being release at one time. If your in good enough physical health to fast for a long period of time then go for it. Also, I realize that fasting is a time for resting...if u have time off stay in and fast. If your worry about any risk consult a professional or get your doctor to run your vitals and blood work.