Have you seen an Ear, Nose and Throat specialist? There are some ear conditions that can cause the symptoms you describe.
https://rarediseases.org/rare-diseases/benign-paroxysmal-positional-vertigo/
https://medlineplus.gov/ency/article/001432.htm
Are you on any medications? A lot of medications may cause this, too. Check the side effects of those. Even if you've been on it for awhile, you may get new side effects of it at any time.