Jax, I've been doing this for almost the whole time I've had anxiety - 35 years. Not doing it regularly anymore, but in the beginning, I'd print up blank calendars. When I would have symptoms, I'd write down my symptom in the "day" box and I'd also write down whatever "consciously" was going on in my life. Over the course of a decade (or less), I saw many, many symptoms repeat themselves. It was like a light went on. What???!!!! Seeing this IN WRITING confirmed to my brain that this was all in my head. I was bringing on these symptoms.
35 years later, I can happily say that when I experience any physical symptom, 99% of the time, I write it off as being benign. Or, I give it some time and it eventually goes away. Sometimes the symptom sticks around for awhile (a few years ago I had the weak legs thing going on for about a year), but you know what? I didn't lose any sleep over it. I just KNEW in my heart that it was the anxiety. Sure enough - it eventually went away. This type of journaling, after time, can make you so strong. Believe me! I'm definitely proof of that.
It takes persistence though and you need to be very diligent about it. But, even after a year, if you keep track of symptoms and "events" in your life, a pattern will likely show up.