Ancajas seems doesn't have a medical condition but just struggling to reach the required weight as maybe he is really getting bulky and bigger for his current division. That's why a good nutritionist is necessary and they hired a new one as part of the team that will condition Ancajas until the day of the fight.
I think he has nutritionist in his side if I'm not mistaken, but there could be some lapses, maybe in the training or after the weigh in because it wasn't enough for Ancajas to fully restore his body to prime in his fight night. And usually if a boxer gets cramp along the fight, it means he lacks fluid and this might be the case for Jerwin and that's why his performance was lacking, as if it was a different version of him that we are watching. But in can be corrected though, and that is the good thing for him, make the weight and then recover and replenish his body and be 100% against Martinez. Get his belt back, and if in the next fight, he can't make that weight anymore, go to the next and have another goal of winning a belt for his Filipino fans.
Yes, he has. It was on the news I think last month.
They hired a new nutritionist as they want to focus on Ancajas' diet compare to what the camp did which they overtrained Ancajas just to reach the required weight. It's like they will balance his training regime and won't focus more on physical activities but rather on controlling what he eats.
With that relax and balanced training, Ancajas should be 100% conditioned on the day of the fight.