Oh gosh, that is incredibly frustrating. I would also be leaning towards idiopathic cystitis, which is often influenced by stress. And yes, it's very likely related to Angus wanting to go outside, and/or to his relationships with other critters in the house. It can be hard to find a treatment plan that works in these situations but here is a link to a very thorough article on the subject:
NON-OBSTRUCTIVE IDIOPATHIC/INTERSTITIAL CYSTITIS IN CATS: THINKING OUTSIDE THE (LITTER) BOX
Here are some quotes:
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The neuroendocrine abnormalities in cats with recurrent idiopathic cystitis suggest a sensitized response to stress indicating that these cats may have greater needs for enriched surroundings than do healthy cats.
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Intercat conflict commonly is present when multiple cats are housed indoors together and health problems are present. Conflict among cats can develop because of threats to the cat’s perception of their overall status in the home, from other animals in the home, or from outside cats. The goal is to reduce conflict to a more manageable level for the cats involved. Treatment for conflict between indoor cats involves providing a separate set of resources for each cat, preferably in locations where the cats can use them without being seen by other cats.
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Is there anyway you can provide a safe outdoor enclosure for Angus to spend some time in?
http://habitathaven.com/cat-enclosures.html