WTT -- sounds like a growth spurt to me!
Otter used to have punching matches with mine for hours on end.
Don't worry about overfeeding her, you aren't. Otter actually took 7 ounces of EBM in one feed once when about 8 weeks old.
And, of course, you can't really overfeed from the breast. Anytime you worry you are overfeeding, remind yourself of Otter. For the first 14 weeks, he fed every 1-2 hours, around the clock, an average of at least 16-18 feeds per day. From 14 weeks until 7 months it was every 2-3 hours, an average of 8-9 per day.
He's still thriving, not fat (but certainly chubby!) and the doc has always been very happy with his growth.
E -- FE gave you great advice, so I won't add much! She's right, you are doing everything right. Work on that left boob as much as you can, preferably when he is calm and more willing. If the fighting and back arching doesn't let up within 5 days or so (that is all the longer a LONG spurt will last), then look for other signs of reflux, just in case it is that. But it is much more likely his 3 week growth spurt.
Tigger -- When I am in a real hurry to defrost the EBM, I take it directly from the freezer, put it in a cup (still in the bag), set it under the tap, turn on the warm water, and let the water run continuously into the cup the bag is in. I don't make the water so warm it will overheat the plastic bag, but warm enough that it thaws the milk fast. It takes about 5 minutes or less to get the milk ready to feed that way.
And if you put defrosted EBM in the fridge, it will keep for 24 hours.
So, if you have frozen on hand, no worries that OH will have to break into the emergency formula. It was very good and sweet of him to think of all your hard work and resist it!!!!!
GL -- What is with left boobs?!?!
Mine is slower than the right one, too!
Oph, is right, keep nursing through it. I had cracked, bleeding, blistered nipples (both!) for about 3 weeks when I first started. I used Lanisnoh like crazy. After every feed, anytime I felt it wear off, and even before a feed when they were really bad. It won't hurt LO to put it on right before a feed. Also, Oph was right about trying to relatch. The latch probably isn't all that great and that is what is causing the cracking. However, it could just be normal for early days. Otter's latch was always really good and I STILL got the cracked-blistered-bleeding thing for those early weeks.