@shaleta30- I'd also like to welcome you to Mayo Clinic Connect. That's a long time to feel light-headed. Have you been tested for any type of Vertigo? I have Benign paroxysmal positional vertigo (BPPV). It's a horrible feeling!
https://www.mayoclinic.org/diseases-conditions/vertigo/symptoms-causes/syc-20370055
Also, do you know what your Oxygen levels are since you shallow breathe? It should be above 90. You can get a pulse oximeter at any drugstore or even Amazon. They aren't expensive at all. The reason that I ask is that shallow breathing can cause this. There are exercises to learn to take a deep breath so that you use all of your available lung tissue. It's called pursed-lip breathing:

https://www.lung.org/lung-health-diseases/lung-disease-lookup/copd/patient-resources-and-videos/pursed-lip-breathing-video. It made a big difference to me.

I take anti-anxiety medication and it's made a world of difference to me. Why not try one and if you don't like how it makes you feel then stop it?