Hello, You were on fasting last week and presently are constipated, are having pain abdomen, dizziness and chills / sweating. Your symptoms are indicative of dehydration, hypoglycemia, low blood pressure, acidity / gastritis, GERD, imbalance in the vitals, etc. You are suggested to take rest. Take sips of water throughout the day to keep yourself hydrated. Take soups, juice or any hot beverage of your choice. This will help you to restore your sodium-potassium and mineral imbalances and normalize your vitals. As your vitals get normal, you will start feeling better. Take laxatives to help move your bowels better. You can take antacids or PPIs to reduce your discomfort. If you are not getting relieve then you can take Spasmol (spasmoproxyvon), one SOS when needed, that will help you get rid of pain. During fasting you should be very careful as it may cause intestinal obstruction and that can become a medical emergency. While fasting take care of yourself, do not stress and exhaust yourself too much as to get sick. Since you are getting dizziness, you should get clinically examined in the ER to check that all vitals are normal. Stay away from addictions of any. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician