Excellent discussion, yay!
To clarify, I should have presented the examples with an "or". i.e., One person might experience their partner making unilateral decisions about how shared money is spent, another might make unilateral decisions about location, another about health, etc. Hopefully no one on this forum is having to cope with one spouse that does all five things. These were examples drawn from various threads, by various spouses.
deborah: Great post, thanks! To answer your question: For a person eating reasonably well, this example would indeed be hard to fathom. But I know several people personally who continue some extreme eating habits (as I used to), for example, and decline to get any help to resolve that. Perhaps applying the phrase "makes unilateral decision" is not quite fitting where the issue is addiction.
Everyone: So, the strategies so far are sit down for calm conversation, if still needed after that go for counselling, if still needed after that leave the relationship. Are there any other approaches that have helped anyone here resolve this in their marriage?