My Symptoms Are Tingling In Right Leg, Both Feet And

my symptoms are tingling in right leg, both feet and numbness which varies. sometimes can not feel my feel. Severe shooting sharp pain in right foot, vertigo, dizzy, feels as though I will fall, trouble walking sometimes, tingling in tongue and finger tips sometimes, sometimes trouble getting my words out, sometimes trouble with remembering the simplist things and even thinking and reasoning, sometimes shaking in my hands to where I almost can not write my name or type. The degree of these things vary day to day. They can be very bad or mildly bad or for a couple days hardly there at all. My balance is always bad. What could it be.