Hi, my DD is 11.5 weeks old and has been going through her growth spurt for the past week and I think finally calming down, but like your LO, she is hungry every hour, wakes us every two hours at night when she used to only wake one to two times a night, and has been sleepy, cranky, etc and definately not on schedule. I tossed the schedule because it was making me frustrated so now we just do what she needs even if it is a feeding before a nap, etc...
Now my daughter also has acid reflux and is on Zantac which only helps neutralize the acid, but she has been fussy at the boob since about 3 weeks old. I thought it could be the acid reflux or powerful letdown, but she still does it. She is usually calmed just by sitting her up on my lap, but if she is in one of those moods if I recline her again to feed she screams. Not sure if this is still the acid reflux or she is just telling me 'mom i don't want to eat'...