There have been a lot of sad events in the news lately, which is really hard on my heart.
There are so many sad things happening in the world these days, it makes my heart heavy.
この場合、次のような言い方ができますよ。
ーThere have been a lot of sad events in the news lately, which is really hard on my heart.
「最近悲しいニュースばかりで辛い」
sad と hard を使って表現しています。
ーThere are so many sad things happening in the world these days, it makes my heart heavy.
「最近世界で悲しいことばかり起こっていて辛い」
sad と heavy を使って表現しています。
ご参考まで！
カナダ 
