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Do these abstinences bespeak an anxiety or mood disorder?

Nah, I just don't care about alcohol, and coffee gives me heartburn (which is normally well under control thanks to a PPI).

I'd look at any long term medication as a factor.

On the other hand if your heartburn causes reflux then the PPI can help sleep. https://www.ncbi.nlm.nih.gov/pubmed/24942514