Hello bella lucia,
you are only on day 4, which is the beginningish of your detox, so you will feel weak as toxins are being released into your bloodstream; this feeling of weakness will continue until such time as your body becomes cleaner and more free of those toxins where your strength will return.............
Fasting supervisors will normally take your blood pressure and pulse each morning, so it may be wise to use and purchase a wrist BP Monitor & thermometer and report your findings here on a daily basis.
It is important to keep warm, especially your extremities....hands and feet. If you allow yourself to chill too much or become cold, then elimination will be checked or even stopped altogether.
Warm regards
Chrisb1.
Let me know how you are getting on, on a daily basis.