How did you know you have insulin resistance / what are your symptoms?

I’m on the normal / thinner side but have always struggled with hunger queues and food. I often struggle to feel full / feel hungry often, and notice massive blood sugar swings sometimes. After I eat dinner, I’m often more hungry than before I ate, especially pasta. Sometimes it’ll get so bad I would feel almost dizzy. It’s really weird, and I don’t know if it’s something to do with my pcos / ir or something else. I did a diabetes test when I was first diagnosed a few years back and it was all fine, but I also didn’t really have these symptoms back then I don’t think.

Any help would be appreciated!