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

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...

I suffer since 10 - 15 yrs from specific fears. It was years that my OCD constantly wanted to be checked if I have HIV or not. I had a lot of sex and I thought this is normal. But I ruminated in my backhead about and was testing like 5 - 10 times a year. After the test I felt everytime so relieved. In Corona I was addicted to porn and even I lost control and was watching pretty hard stuff. I was chatting with a girl and we fantasized about really disturbing things. I never wanna meet her and for me was sure it's just kinda onlinestuff. I was in a relationship 3 years now. And I lost fear of HIV. But then came Morality OCD, Real Event (this chat) and after some times POCD. This combination was knocking me out, I felt like the badest person on earth. I did everything wrong and searched for relief and reassurance. It put me to the point of suicidal. I never ever hurting somebody, but my brain was making me a monster. I had to quit the relationship because I just couldn't give her what she deserved. I was in a clinic for 3 months. And we tested medication with ERP (before I took escitalopram for years). Anafranil was working first, then too many side-effects. I tried even without meds, but was so depressed. Now on sertralin for 5 weeks, but only 2 weeks on therapeutic dose 200mg. And wow, now I really feel so confused in the brain. I feel like how big my OCD became. The specific thoughts are not anymore, BUT it sticks on EVERYTHING atm. It's delusional how it feels in the brain. I really hope so deep my brain makes finally a reset and I need to wait it out. I could live with OCD for a long time but the last 1-2 yrs it took absolutely everything. I remark that POCD doesn't stick anymore like before but my brain is now constructing a very bad future because of past mistakes (that I all discussed with family, friends for relief over and over and over again). So it's like my OCD is now Real Event (The sexchat) again. Anyone was on the same point in life?