Ever since I first started getting panic attacks and health anxiety I have felt like this, nothing actual off ( not actually dizzy or off balance) but sort of feels that same sensation? Really hard to explain. I think it must just be the adrenaline from all the worry! My hands have started shaking when I have to focus them on something for example holding my phone with one hand and texting but it might of always been like this? I think we just notice things a lot more all of a sudden and assume it's new. I understand your worry though, I've even had dreams about getting diagnosed with one and now just fear that it's a sign, horrible thing to get caught up in!
I think if we truey had something like this we wouldn't need to second guess our symptoms, there would be at least one obvious one! Like Marc said about the headaches! Xx