Nothing I've experienced seems to fit perfectly, but I have a few thoughts that can cause trouble. The first is allergies (tiny bits of proteins from your diet which pass into BM). Besides refusing to nurse, the fact that nursing at night is easier makes me wonder about this possibility.
Pain receptors are dulled and sleepy at night, and so infants which are having pain from nursing will feed more calmly then. But that doesn't mean his source of pain, if that's what it is, is allergies. My oldest daughter's symptoms started showing up about 10 weeks, too.
I know two other things that are like personality quirks. Both of my daughters liked settling down to nap being held by their dad, and I came the conclusion that they wanted away from nursing. And DD1 got discouraged very easily, and if she didn't latch on perfectly the first instant, she would scream for 30 minutes! But this started very early. Plus, she hated my monster let-downs. She had a weak sucking action and couldn't keep up, I guess. Now she's older, I see she has an overbite. DD2's first-day nursing surprised me with how powerful it was. No wonder we had trouble!
One final thought, and again this scenario doesn't quite fit in perfectly with what you've described: DD1 had trouble growing starting about 4mo. She wasn't just on the bottom of the chart, but she dropped down percentage points with every visit (this is more telling than where on the chart they started from). We tested different scenarios.
I kept saying since she was an infant that she didn't seem to understand about hunger. But everyone, every nurse, every doctor, said "she'll eat when she's hungry." But to me, she showed every sign of not understanding that eating would take away that awful feeling in her belly. Even as late as 2yo, I would finally coax her to eat, and her awful moods would melt. Finally, I was referred to an "eating therapist". She helped kids with physical eating disorders. I told her this same impression and she agreed with me! She said that eating when hungry is actually a learned response, albeit one learned very early. Most kids make this connection, no trouble. But a few, especially those with pain issues associated with feeding, will not make the connection. I WAS RIGHT! 2 years later, DD1 announced one day, I am not kidding, "Oh. Eating dinner made my tummy feel better." (Know that I had backed off the eating issue for a couple of years at that point. I could see by her facial expression, wide-eyed with discovery, that this truly was an "Aha!" moment.)
Forgive my lengthy response. Hopefully by the time you read it, all will be right again. But if not, I hope you can see something of your situation in everyone's responses.