Reassurance isn’t reassuring after awhile?

Hello! I just got diagnosed with OCD a week ago and joined the app today to find a sense of community. Since my understanding of treatment is minimal at this point, I'm confused why everything on here tells us not to seek or give reassurance? If someone could explain the reasoning behind that it would be greatly appreciated, as I want to make sure I'm not only watching out for it in my personal life but also using this app appropriately.

Does anyone else experience a moment of clarity where you feel strong relief that the intrusive thought isn’t true, only to then immediately start questioning if you’ve only convinced yourself that because you don’t want the thought to be true? I’m pretty confident it would take some crazy mental gymnastics to actually successfully convince myself I didn’t do something that I deep down knew I did, but every time I resist the compulsions and try to sit with the uncertainty or tell myself to think about what is logical, I usually briefly know that this probably didn’t happen but am unable to move on out of fear I’m just in denial and have convinced myself of that.

Does anyone else find that their compulsions actually make their OCD/obsession worse? I don’t mean in the obvious way, like that it strengthens the OCD cycle, I mean in the way that when I perform my compulsions, they make my anxiety so much worse in the moment. My main compulsions are ruminating, arguing with my thoughts, and memory reviewing, but they all just end up giving me more intrusive thoughts/questions, making my anxiety more intense, and making me think my intrusive thoughts are real. I’ve always read that you perform compulsions because they bring you relief, and I suppose for me, they more make me feel like I’m working towards “solving the issue” or “answering my question”, so then is that my version of “relief”? In reality, it just makes my anxiety worse because the more I ruminate/memory review, the more jumbled together and foggy my thoughts/memories become, which in turn makes me think that if I ruminate/memory review just a little more, I’ll be able to “push through that fog” and find my answer, which then also causes me anxiety because my brain feels foggy and hence makes completing my compulsions/figuring out my obsession impossible (which I guess is good because I’m not supposed to complete my compulsions). All of this is making me believe that I don’t have OCD and that my intrusive thoughts are true and that’s why I can’t shake them and that’s why I feel the need to figure them out and why I feel so foggy… Or is this just meta OCD playing it’s devious tricks on me? Has anyone else experienced this or is this not OCD and I should be concerned that my obsession is true?