I messed up! !

Ok so I don't really keep track of which boob my son eats off of. He eats on demand, and I just give him the one that hurts more (I have over supply, so it gets super painful when it's time for him to eat). I try to switch sides some times, but I'm so tired that I either don't remember or can't gauge how much he's eaten so far. Any way, long story short: I was pumping and noticed that the right boob produced less milk (but he ate about an hour ago, I just can't remember which side) and the left boob was way bigger and produced a lot. I want them to be the same size, but when I pump until milk doesn't come out any more it takes a full day of a fussy baby waiting for them to fill up again. And, they still come back uneven. Ugh advice please?