One step forward, two steps back

My symptoms (other than the partial hearing loss, which seems permanent) had become milder almost immediately after beginning the low sodium diet and this result was very encouraging. But for whatever reason, I have had two days back to back with moderately severe vertigo attacks. Today's hit me at work and I had to spend an hour with my head on the desk trying not to puke. Hope this doesn't become a daily occurrence. Kinda bummed out now.