Husband had colonoscopy monday, fever (100 - 102) and headache, no bm ever since, feels bad.  help!?

GO TO MD!!! I definitely would contact the md that performed the colonoscopy asap. There are a few rare complications post-colonoscopy that you need to be worried about and be seen asap. If unable to see that md - go to er! Good luck!
Needs to see doctor. Complications of colonoscopy include perforation. He should be seen by the individual who performed the procedure asap, and if not available, go to er. Do not delay.
See your Dr. He needs to see his dr. This may not be related to the colonoscopy, but it might, so he needs to be checked.