Thank you for the query.
, vomiting and weakness after a colonoscopy can be a sign of intestine perforation (probably limited). It does not happen very often, however it is possible.
Bleeding from large intestine is also possible especially if there is any blood in stool
Other possible reasons are gastrointestinal infection
(especially if fever is present), peptic ulcers (unrelated to the colonoscopy).
I suggest you to visit your doctor as soon as possible. Blood work, CRP, abdominal ultrasound, abdominal X-ray
should be done.
Hope this will help.