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For a long time I've suspected the coffee at work.
A few years ago I'd identified the sugar bowl as a culprit.
Then we moved buildings (and coffee suppliers) and I
started getting problems again.  Sugar and creamers are in
separate packets.  3 week vacation and I was fine until I
went back to work again.

After a few weeks I cut out coffee at work - but I still drink
coffee at restaurants and sometimes at home, with no problems.

SO.... What could the problem be at work?  The bland
coffee?  The coffee filters?  Just drinking coffee regularly
instead of tea?  I'm running out of ideas.

Stuart