Keep doing what you're doing. Have you got an electric toothbrush? Sometimes that helps too.
Try also, feeding on all fours with baby underneath you. This uses gravity help get milk flowing better.
Are you using warm face cloths at all when massaging? Do be careful to be gentle - too hard and you can cause more inflammation.
You can also try feeding in different positions - sometimes angling baby so their chin is pointed to where the blockage is can help.

At this point I would suggest getting an appointment with a doctor just in case. Sounds like you know the warning signs to look out for, but 3 days with no improvement is a bit worrying.

Good luck!