Seroma fluid build up

My lumpectomy was in June and I still have a seroma but it is getting smaller. I plan on taking it up with the breast physio asap as the one standing in for her called it a haematoma.  Need an officialish diagnosis.  I do get a bit of pain but it is nowhere near as bad as my underarm axillary clearance scar pain.  That is constant and am going to ask if I need referral to masseuse. Codeine just gives me constipation which gives me rectal bleeding TMI and makes me think this just goes round in circles.  Coloxyl by itself is good for softening stools but was warned that with continued use of senna and coloxyl, some people are losing use of natural sphincter propulsion.  Plus I find laxatives just give me diarrhoea!