@hergiew, I am not familiar with the availability of specific support group for donor. I am a volunteer mentor on Connect and I have located a couple of discussions in the Transplant Discussion Group that I want to share with you.
I invite you to post your question in one of these discussions where it can be seen by kidney donors.
-Donating my kidney: Any tips? What do you wish you'd known?
https://connect.mayoclinic.org/discussion/wed-may-20-20-kidney-donation/?
-From a Living Donor: One year later, what is your life like now?
https://connect.mayoclinic.org/discussion/a-post-donation-check-in-one-year-later/