Therapist told me I have olfactory reference syndrome

As the title says. I'm very upset, I've been reading about it and it literally suggests that I'm delusional. I have good rapport with therapist and am so upset he is suggesting that the odor isn't real? I don't want this to ruin the therapeutic relationship but I'm so upset. I want to tell him he's wrong and to never mention it again but I can't even uphold that deal because I do need his support with the odor issue because it's very taxing and overwhelms everything else in my life.

I'm upset and embarrassed. I am high functioning though I do struggle w PTSD and depression/anxiety. Could I really be delusional and have no idea? I can smell the odor clear as day.