Hi there Renee,
I actually literally joined this forum a few minutes ago, and I saw your post in the features list. ( I have been diagnosed with PTSD in 2016 )
I am so sorry this has happened to you. Him asking for "photos" of whatever it is , is absolutely inappropriate. I can't imagine any circumstance where such a question would be needed, unless legal, and that's for someone in court to see.
It doesn't happen often, but since therapists are humans too, they can get lost in their own ego and arrogance. I kind of feel like this may have taken place, because I don't feel like he's putting you on the same level (of respect). I'm studying psychology and if I ever do become a therapist I would never think to do what hes did.
If he really doesn't believe you, he could have asked in an appropriate way.
These situations are a leaf on our learning tree, to remember that other people don't determine our self worth, we do. I know it's hard, and it's worse when its a person of authority (I know from personal experience), but you'll feel empowered over time.
I haven't been through exactly what you have regarding the photos, but I do understand a professional not taking you seriously or not believing you.
When I was young, maybe 8 years back (total remission now , like another life time ) I took myself to the doctor and requested a referral form to get medical rebates so I could be treated for Anorexia Nervosa. The doctor laughed in my face and told me A.N isn't a mental illness, so I had to ring the medical rebate number myself, mid way in the illness where I was even lucky I would realise without heavy guidance. They profusely apologised even though it wasn't their fault, and then talked to the doctor, who reluctantly gave me the rebate form. I could clearly see that she was having some pretty serious cognitive dissonance and couldn't apologise.
When I ended up seeing a specialist for eating disorders, she face palmed over the story, given her whole career is about eating disorders.
Take care -