Oh I do think the PTSD (anxiety disorder) is getting in the way of your obtaining support in this. You know, your professor probably knows you are dealing with something, if I were you I would let him know it's anxiety. He might be suspecting something worse and telling him will alleviate any "fears" he has about your capability.

Unfortunately, it's almost the norm from what I can see, that psych students have disorders. Now whether many years ago when I went to college this wasn't the case ( and I believe this) or that they hid them better, IDK. But no one is perfect, and in the course of studies and internship, it's all about you finding your weaknesses and learning to cope and manage life around them.

Better now than too late, to disclose. This will give you more time and hopefully support, to work through. Right now it's adding to your anxiety, your symptoms, and your inability to cope.

(((hug)))