If an ulcer is actively bleeding it may be necessary to stop that bleeding. That's not what you're describing, though. Whether your anemia is a result of bleeding from these ulcers is less important than what's causing the ulcers, and how it's being treated. If that's not addressed, then it doesn't matter whether you laser this batch, since more will form.
is this pouchitis? Cuffitis? Crohn's? There are treatments for each of these. When the treatment is effective then the ulcers will heal.