My experience with pain pattern that present like this, is that it is genreally being over trained. Think about what things that you are doing through out the day and particular exercises that are causing you the most pain. If possible try to refrain from doing them for a couple of days and see what happens. Also the pectoral pain normally just under the collar bone is a muscle that is in spasm.
R you still in the sling? This will generally perpetuate the problem...Judging from your description of your post-op course, you have been probably keeping a pillow under you elbow or hugging a pillow to get comfortable. this will also perpetuate the pectoral pain.
Has the doc discussed any anti-inflam meds?
OPI