Half Way Through Prep. For Colonoscopy Test, Barely Ate Anything

Half way through prep. for colonoscopy test, Barely ate anything for last several months, 2 prev. trips to emerg. for bowel blockage confirmed. Extremely light headed, tried one Ensure drink..half bottle Gatoraide for electrolights...changed nothing. I* am 61 yr. old female. blood not in stool, only when cleaning self, very small amount. almost negligible...... Last emerg trip 1 month ago was high white blood cell count. I can't keep drinking feeling so poorly. Thank you...Katherine I Victoria B C Canada just figured out I have to pay for this information?? Not going to happen if I do...will tel. my emergency room instead...