It's all quite intolerable as far as I'm concerned.
It's too much for me.
Plastic Memoriesさんの英文ですが、次のように言うと自然な感じになりますよ。
ーA general is talking with a subordinate about the reasons why he thinks the world is in chaos and war, suggesting it is mainly due to the corruptions of leaders.
この時に「なんともやりきれない思いだ」は次のような言い方ができます。
ーIt's all quite intolerable as far as I'm concerned.
「私にとっては、なんともやりきれない思いだ」
ーIt's too much for me.
「私には、やりきれない」
このように簡単に言うこともできます。
ご参考まで!