For About 3 Months Now I Have Been Experiencing Feelings

For about 3 months now I have been experiencing feelings of being light headed when walking or moving. I have had a C.T. scan of my head and the usual cardiac tests but all is well there. I wondered if I am suffering from a vestibular disorder. The dizziness does not occur when I am resting and I am not suffering from nausea or headaches. I am 77 years of age and do not take any medication. Because I feel so unsteady when moving around I do suffer anxiety.