Severe giddiness. Me to have giddiness.

I have underwent all major tests including whole body Apollo check...but my problem is not diagnosed yet... From past 10 months there is severe dizziness continuously all day long every day...I underwent various brain tests but everything normal..but I am having spondylosis I think not sure as I went MRI spine also..and doctor told little spondylosis problem 6 months ago...but without using neck band I am not able to do work normally...my question is that if I am having spondylosis then is it normal for me to have giddiness...I am really I depression becoz of this disease... because still doctor are not able to catch this disease... One thing more I want to tell you from past 06 months I am taking medication like nootropil and stugeron, as doctor told me it might be meneries disease also, but not even a single percentage improved... To whom I should consult whether neurologist or orthopedist, Please find a cure for my giddiness and sometimes I have spinning sensation also.