It's the former since he 責めた.when Takashi address his mother, is he still blaming her for his swollen legs or urging her to do something about it?
弱る means 困る there, so it's the former.And 母は弱らされていた means that the mother was/looked troubled or that she became dispirited?
According to alc it can mean "terrain" so probably yes.Hi Toritoribe, another doubt, here: そして昼間は感じられなかった地域がかしこにここに杉の秀並みの間へ想像されるようになる
Do you think that I can translate 地域 as "geography of the area/region", "geographic features"?
"And here and there, between the tips of the cedar trees, I could have a glimpse of the geography of the area that remained hidden during the rest of the day"