Hello, Three Years Ago I Was In A Auto Accident

hello, three years ago i was in a auto accident and suffered many injuries, c1 c2 fracture, skull fracture, spine fracture, collapsed lung left dislocated collarbone, broken right side ribs,lacerated liver, chest fracture. my concern is now i am having neck crackling and popping with every movement of my head. i sometimes get tingling in my fingers, i sometimes have blurry vision. i always get headaches and lately i get dizzy throughout the day. I have noticed that when i am laying down or just stting down if i get up even slowly i get so lightheaded i almost black out.sometimes i get jittery like hard to explain. i feel as though i am having to over focus on the smallest task and sometimes i feel as though my whole body is off making it feel as though i have to concentrate on walking.i do not know what to do or who i should see. i get so tired and i am so scared i will faint