
Going to be REALLY honest. I don't really like the brother. His brother was essentially kicked out of the house when he was...16? And essentially had to whore himself out in order to survive. Brother then shows up and is all, "Oh, didn't realize you left home two years ago. Why didn't you say anything?" Bitc* Please! Why didn't you look around and check in on your own family? You obviously didn't give a rat's as* about him!

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So the reason that he wasn't able to get nourishment was because he was rejecting it, and apparently the doctor has it all figured out. Interesting...so then, is the doctor Nux? That would make the most sense, and explain why he was hiding in the corner, and knows how to help our wayward main character.
Guessing that the lab wants them to get together, they probably have a hypothesis that the MC isn't infertile, he just isn't responding to alphas that don't have similar genetics to him. Add in the debt that he owes, and the lab no doubt is waiting to swoop in and claim any baby that the two would produce. Alpha probably knows this, and is trying to drive the omega away. What I want to know is what the lab has on the alpha to be able to lock him up. What crime?? was committed by him that they can control him to the extent that they do. And who does the alpha owe anything to, he sure does seem money hungry!