I've seen your post on the othe forum and I agree completely with what everyone else is saying. You do sound like you are exhibiting some of the symptoms of scds. Not everyone will show every symptom and some people go through life without ever knowing that they have it and it is only discovered when an autopsy is performed. When you said that your dehiscence is only the size of a pin head, that is not unusual. Mine measured 2.5mm but you know that the whole of the inner ear only measures about 1cm. The largest dehiscence I remember seeing reported is about 6mm, but there is no relation between the size of the dehiscence and the severity of the symptoms.
You asked me about my symptoms. When I first started to get ill it was just the dizziness, several months later I became sensitive to sounds. Then came autophony, and then after about 10 months of being ill I realised that I could hear my eyes move. I never suffered from nystagmus which is one of the "classic symptoms".
Your reaction to pizzas and other very salty foods sounds suspiciously like a sided effect of your hydrops.
When your surgeon mentions that sometimes scans show a false positive for scds, that is only normally the case when the ct scan has been performed incorrectly. Because the dehiscence is so small a ct scan should be done at least 1mm slices if not 0.5mm. Many people on the forums have had to have many scans done before they have been successfully diagnosed.
It looks like you're getting some good advice on the forum and I really hope you get to the bottom of your illness.