Circulation problem or something else?

yes its most likely is a circulatory problem stemming from your neck, sounds like thoracic outlet syndrome because of the symptoms in your hands. you can see a neurologist, especially if these symptoms coincide with the "passing out" feeling, it may be vestibular basilar insufficiency this usually happens when you are turning your neck to the side like when you are looking over your shoulder. it doesn't sound like a dvt or blood clot because those symptoms would not be so sensitive to mechanical deformation or be gravity dependent. also dvt would accompany redness prolonged swelling and heat, not loss of color. most importantly your symptoms (uncoordinated and passing out) are rather serious and are worth seeing, if not, a neurologist than your primary MD, also even worse are any changes in your hearing and vision in conjunction.