You have significant narrowing in the canal in your neck “C6-7- There is a central/right paracentral broad-based disc protrusion which effaces the ventral thecal sac and results in moderately-severe canal stenosis”. The MRI noting disc degeneration but the X-ray being normal is typical. X-rays do not reveal early degenerative changes.
This condition (stenosis) can cause myelopathy (dysfunction of the spinal cord) which can cause imbalance. See the section regarding myelopathy on the website to see if your symptoms match. Your complaints of “why am I so off balance? I also have lighthing like sensations and my arm goes numb on my left side. I have numbness and tingling in both hands. sometimes, my right hand toward the pinky up to where my wrist begins will go completely numb” do coincide with myelopathy. You do have to be careful as fibromyalgia has some matching symptoms.
A thorough physical examination would help to differential those two conditions.
There is nothing in your lower back MRI which would cause “heaviness in my legs, as well as a deep pain from the top of my legs all the way down to my feet, making it feel as if I am carrying concrete pillars. walking for long stretches”. Those symptoms could be from your fibromyalgia.