We've looked into OPMV and crypto also.
Again, IBD is not a given in my case..............but almost everything else has been ruled out. It's a waiting game at this point.
Without inflaming the issue any further, I'll PM you with some additional info. One thing I have learned about IBD is that the vets that have a different view on it's potential prevalence and their frustration at trying to diagnose the disease in live animals.