I am so sorry for what you are going through, lost one to FIP in 2002. Lost my orange cat last monday, 10/22, to cancer.
Prayers up for you both.
My heart goes out to you. Orange cats in my experience are remarkably gentle and affectionate.
This was totally unexpected to me. I was unaware of this disease.
What symptoms did your cat in 2002 exhibit that set off warning bells to you?