Yeah! It was incredibly frustrating to a point where I was even thinking of force-feeding him. But luckily I never acted on that and at least tried to stay patient the entire time.
My theory is that perhaps he went into that 11-month-long hunger strike because he was growing too fast. He went from 1200g to 2010g in a matter of 7 months! So perhaps he just wanted to go on a diet, hah...