What does "congestion and edema" mean in colonoscopy report :-/ they couldnt find any inflammitory disease?

Nonspecific: It's a nonspecific finding indicated that the mucosa doesn't look completely normal. Could be consistent with a mild colitis.

Often "normal" : The bowel prep before colonoscopy often causes spasm of the colon muscles, leading to biopsy findings edema and congestion in the mucosa layer on biopsy. These are not related to " inflammatory disease". If inflammation was suspected and not found then capsule endoscopy to evaluate the small intestine might be indicated if you symptoms are severe enough.