It's been three years since I was transferred to the Tokyo, but because I haven't been able to achieve anything big, I feel rushed.
ご質問ありがとうございます。
"It's been three years since I was transferred to the Tokyo,"＝「東京に転勤になって3年になりますが」
"but because I haven't been able to achieve anything big,"＝「大したことを達成できていないので」
"I feel rushed."＝「焦っています。」
ご参考に。
アメリカ合衆国 
