Hi C. -
I am sorry for what you are going through. I had mastitis a few times and it is very painful. I am proud of you for nursing and for giving it such a great shot. It's very diffucult - you should be proud of yourself.
As for the mastitis (these are all suggestions my lactation consultant gave me), make sure you are massaging your breast in the area where you have the lump. It is so painful - but will help. I know you said you were exclusively pumping right now - which is great to help get rid of your mastitis. If your son is able to latch onto your infected breast, that will help. He sucks better than your pump. :-) If this is a possibility to have him nurse - point his nose to the infected section (I often got into some funky positions with my son to do this). By doing this, he will suck the hardest and relieve you more. Just a suggestion - I would try to not cut out a complete "pump session" (if that makes any sense) until after your mastitis is better. I am afraid if you drop one completely, it will be more painful in your infected breast.
I would drop your 10:30 or 2:00 pumping first. Then spread out the time between the other. Like maybe pump at 5 am and then wait until 1:00 - then pump again at 6 - ten before bed. You may get a little engorged, but after a couple of days you will notice a difference. That is why I think you might need to wait to drop a feeding until after your mastitis is better.
You're doing the right thing for you and your baby. I know it is such a difficult decision - but only you know what is best for you and your little boy. The first two months are the most difficult. The most important thing is your love - which is what he gets every second.
You're doing a great job. Keep up the great work. Take your time. :-)
S.