Swimmers usually get the kind of problems you have described. I would advise you to take complete rest for 2 to 3 days and try interferential current at a physiotherapy clinic for a week and your pain should settle down.Try the following exercise when the pain subsides:Climb as high as possible when cleaning so that you can work mainly below shoulder height. Remember that reaching out over a table or under furniture to polish also takes your arms above your shoulders.Gradually add resistance to strengthen your shoulder cuff muscles and then get back to swimming.