I've had this, v. painful. Found physio not that effective, best thing is complete rest. If you can keep your arm in a sling for a week or two, it's the quickest way to heal it (only my anecdotal experience)
Eileen, don't sweat over where you put the thread. If necessary, long-suffering Admin will move it. Since it encompasses Peckham and parts of East Dulwich, I think the Lounge is fine (ignore that miserable bugger who is hassling you).