お医者さんのひどい間違いが本当に腹立たしい。けれどあなたが無事に帰ってきて、少しずつでも身体が回復していることは本当にうれしいです。どうぞお大事にしてくださいね。
I am very irritated at the dreadful misunderstanding that the doctor has made. But I am very happy that you have come home safely and that you are recovering little bits at a time. Please take care.