I had a slight fever and the upper part of my left arm was sore, so I stayed home and slept.
ーI had a slight fever and the upper part of my left arm was sore, so I stayed home and slept.
「微熱と左の上腕が痛かったので、家にいて寝ていた」
to have a slight fever で「微熱がある」
upper part of one's left arm で「左の上腕部分」
sore で「痛い」
to stay home で「家にいる」
ーMy left arm was sore where they gave me the needle and I had a little fever, so I just slept at home.
「注射を打った左腕が痛くて微熱があったので、家で寝ていた」
where they gave me the needle で「注射を打ったところ」
to have a little fever で「少し熱がある」
ご参考まで！
カナダ 
