I would be concerned that the giardia hasn't resolved, or there may be something weird like a tick disease, with the anemia. Maybe there is something dietary going on. Certain abx can cause anemia, but it sounds like he has been off of any meds for a bit.
There is no standard test for diabetes insipidous. I would ask for a referral to an internal medicine vet if an answer isn't found with your regular vet.
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