Is it possible for a single specific thought related to your theme to bother you for a long time

I’ve had different themes of ocd throughout my life. Can they all differ such as how the thoughts may present? Currently my thoughts feel so true immediately (like they genuinely feel like what I think) but in the last theme I feel like it may have been more of a “what if I think this” type of situation

Are intrusive memories a thing? Because I have memories pop up throughout the day, usually regrets or mistakes from when I was younger, but it's almost uncontrollable? It sort of feels like I'm testing myself to see if the memories still make me anxious or something. I can't tell if I'm willingly thinking of them or if they just invite themselves in. They're just always at the front of my thoughts unless I'm really engaged with something else or out and about with other people... I'm trying to treat them like I do with intrusive thoughts, but occasionally, it's like I can't resist NOT ruminating on these past events. I try not to, but then that only makes them more persistent. I'm just curious if anyone's dealt with this or possibly has advice? I'm guessing I'll just have to sit with it. I don't think I've asked about this before, but I might be wrong lol. I forget easily 😭 I'll probably speak with my psychiatrist about this, too, but our next appointment isn't until August. She's not an OCD specialist or haver, so I thought I'd ask here, just in case anyone can help! 🤍

How long do you guys have to sit with a thought for it to go away? I have sat with thoughts for days and days before and the anxiety was crippling to where I couldn’t eat or sleep. Until I asked. And especially something I’ve already asked about before that upsets my husband but my brain was like did I hear him right? Yada yada. That’s about where I’m at right now. I feel so sick from anxiety