Many years ago I used to suffer panic attacks (about 30 years ago). Apart from all the other symptoms… thinking I was about to have heart attack… thinking I couldn’t breath… etc… I also felt the same sense of vertigo as one feels when afraid of heights. It was really as if the ground was moving and was frightening. For a while I was agoraphobic, which is a paralysing fear of going outside.
I never heard it called ‘phobic vertigo’ but that is apparently what it was.
I get vertigo often with MS but it is not accompanied by the sense of sheer panic that I had all those years ago.
So unless you feel extreme levels of panic with the vertigo, yours is not ‘phobic vertigo’. Far more likely (if you are dx with MS) to be vertigo caused by the MS which is quite common as the neuro should know!