Has anyone here had an MRI scan? Due to how severe my OCD is my psychiatrist requested it. I'm very nervous about the results

Therapist put it on the table that I should see a psychiatrist that she recommends. I felt relief because maybe the psychiatrist can tell me what's wrong and the plan going forward but im scared because what if my symptoms vanish or i miraculously get better (i doubt it) then what if i've been making a mountain of a mole hill. Or what if i dont know how to express myself. im obviously not scared of getting better, but i just don't want to seem like im making people scramble to treat me and then it turns out theres nothing wrong. like what if i don't have OCD and im just making all this stuff up in my head. what if i just want something to stress about

Can it? I've had it for 5 years, not just in the background, fully severe and acutely crippling. I can hardly go through life, my memory and cognition are very poor, I struggle with comprehension and have difficulty thinking clearly or having conversations to people about everyday things. Like I can only narrate my ocd thoughts in my head, regular thoughts take too much brain power to think about. I have very high anxiety and depressive feelings also. I'm just worried my brain is structurally changed from this ongoing traumatic experiencs and when I'm in my late 30s or 40s it's going to evolve into neurodegenerative diseases. I want to get a brain scan done and see if everything is alright. What kind of doctor or tests would show me that?

when i stay alone at home, the thought immediately comes to my head that I can touch myself, don't I imagine those thoughts?! I'm a bit scared of this "idea", especially since I've had these types of tests before... can anyone help if they've had a similar experience? what worries me is that it is my wish, i.e. that I can do it, and not ocd...