well, as far as low glucose
is concerned you can take fruit juices in small dose at regular interval if you can tolerate it well.you should also take some vitamins and micronutrient
to meet the body demand.
as far as blood in stool
associated with abdominal cramp
is concerned it can be due to amoebic collitis ,tubercular or salmonelosis or may be due to inflammatory bowel diseases.so for this you should meet an enterologist and should go for some test likt TLC, DLC, Hemoglobin
estimation , antigen detection test for suspected pathology and then you should follow your specialist for its management.