My son is due to have a colonoscopy tomorrow he has been very ill with abdominal pain and constantly going to the toilet . The problem is now he took the first drink and afterwards he vomited now we aren’t sure if he should take the second and third drinks or call and cancel . Could anyone tell me please if they know what we should do ? He has waited about 8 months for this appointment so don’t want to cancel . The clinic closed and we have no one to advise . Many thanks