Relationship anxiety? Terrified my thoughts are real

Hi, I’ve been struggling with something that honestly came out of nowhere, and I’m hoping someone can relate.

My partner and I have been together since high school. Things weren’t perfect back then — we both had a lot of growing up to do — but over the years, we’ve worked through it and are honestly in the healthiest place we’ve ever been. That’s why all of this has been so confusing.

One day, out of nowhere, it felt like a mental fog just hit me. I started overthinking everything. I’d get these random anxious thoughts about my relationship — like, “What if I don’t love him the same way?” or “What if I want to be with someone else?” Even though I don’t actually want that, the thoughts feel so real in the moment that they scare me.

Sometimes I even get this weird grossed-out feeling toward my partner, or I suddenly feel turned off — and then I spiral, wondering if it means something is wrong. I know I love him, but these thoughts and reactions make me feel like I don’t trust my own mind anymore.

I don’t feel like I’m constantly spiraling the way I was at first, but it still feels heavy and confusing — like I’m scared of what my own brain might come up with next. I think it might be anxiety-related, but I just want to know if anyone’s experienced something similar and gotten through it.