Luckily I didn't have any bad reactions to the veggie juice fast at all! Only mild discomforts as to be expected.
What relieved a lot of anxiety was monitoring my blood Sugar with a glucose meter to see my Sugar levels were fine the whole time and any discomfort feeling was just detox reactions and not low blood sugar. That was actually real empowering for me that made me able to mentally take on any detox reactions with greater ease because I knew it was just temporary detox symptoms and not some potential severe health problem.
Using FasterEFT helped a lot with the cravings I got during the juice fast. That might have been the most useful!