healing nervous system

I was so frustrated with people saying a whole bunch of nothing and not giving me the solution, from my research nervous system regulation involves the body and emotions, I did breathing exercises 4second inhale 8second exhale, to help regulate and balance my emotions, and body simultaneously, ‘nervous system’, seems so vague like where is it located and how do i fix it, but through regulating my emotions i now feel free, and can function fully. I did a 4second inhale and 8second exhale, and i asked myself “do i feel emotionally balanced and regulated?” Thats how i’ve been able to finally regulate my nervous system, now when i’m outside i feel emotionally steady. NOT a professional but hope this helps you!