Heat, and pump/feed in different positions than you normally do, while massaging the hard spots. Can try massaging and hand expressing while laying in a warm bath with Epsom salts. Take a lecithin supplement to help reduce the chances of reoccurrence.
what helps me is to keep putting the baby on the boob that is clogged & massaging the area (as painful as it is 🥲) & pumping!! sorry you're going through this