This one is especially for K who seems to be experiencing tendonitis.
Here are some new specific stretches/exercises: www.mckinley.illinois.edu/handouts/tennis_elbow/tennis_elbow.html
It might also be an idea to temporarily change your grip on the erg to minimize chances of repetitive strain injury. For example, on the Concept2 forum, someone has suggested gripping with thumbs above/below the handle.
Also, it would probably be worth your while investing in a visit to a physio who understands rowing.