First, the arching/spitting/pain/fussy symptoms that you are describing sound like textbook acid reflux. I am not his doctor, and therefore am not able to diagnose reflux in him, but from my estimation, it is absolutely worth scheduling an appointment SEPARATE from his well baby appointment to talk about this possibility. And soon. It's not dangerous, but the lack of sleep and general unrest that you've been having to endure is!

Secondly, the hunger. This seems to have 2 probable roots - your body's lack of milk production during daylight hours and his inability to eat enough to stave off the hunger longer because he's likely in so much pain during feedings that he's cutting them short. The milk production issue should improve with time, but in the meantime, there are some herbal remedies that can help, under the direction of a lactation consultant. If your pediatrician's office does not have a lactation consultant on staff, contact the hospital where you delivered, as most hospitals have outpatient lactation services. You can schedule an appointment for you and your baby to be evaluated by the lactation consultant, and recommendations can be made from there to improve your daytime milk supply.

The possible acid reflux issue, can be addressed, sometimes through medication, if that indeed is contributing to his ineffecient feedings. In theory, once that problem is fixed, he will be able to tolerate feedings better, therefore he'll eat more at each feeding, and therefore he'll stay full longer. Lastly, the issue of a possible underlying milk/whey allergy. Some babies with this type of allergy have obvious symptoms like blood in the stool, but other babies just have what appears to be very bad acid reflux symptoms. There is a way to test for this in your pediatrician's office. Even if the test is negative, breastfeeding mothers who still have a high suspicion can go on elimination diets to determine which foods are causing the problem...these dietary modifications can be spearheaded by your local lactation consultant as well, but most often include cutting out dairy, eggs, nuts, and wheat. That's a tall order for most moms, so don't try to take that on by yourself...contact a lactation consultant, please!

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