I would like to thank you from the bottom of my heart.
I would like to express my heartfelt gratitude for your kindness.
I deeply apologize to you.
Thanks for making my heart flutter.
I thank you with all my heart.
I'm very grateful for your sympathy.
We would like to sincerely thank all of you.
I tender my cordial thanks for your sympathy.
Thank you very much for your hearty hospitality.
I sincerely appreciate all of you.
Thank you for being concerned about me.
I ought to thank you.
私のことを心配してくれてありがとう。
私のことを心配してくれてありがとう。
Thank you for understanding my feelings.