Lipase is the enzyme that breaks down fat. This is just a shot in the dark, but I would guess the types of fat you are eating are out of balance or something... Are you getting plenty of good stuff like extra virgin olive oil, butter, virgin coconut oil, avocados, nuts or nut butter, or dairy and meat from healthy animals? Or do you have either too much greasy food with transfats or else a ton of highly refined vegetable oils like canola, corn, soy...? Do you have enough essential fatty acids? Can you take some fish oil capsules to improve your healthy fat intake? Nordic Naturals is one of the better brands and they have fruit flavored capsules. Fish oil always made my milk more filling, and improved my hormonal outlook on life =)
Without lipase, your baby *might* have a hard time digesting the fat in your milk... but if you must scald, definately choose the stove over the microwave because microwaves are less gentle on nutrients... microwaves have a different frequency that alters molecules.