I hope the physical therapy works for you. I know treatments can be different for each of us and may or may not work. If you want to do some in depth reading, I did a search on "vertigo physical therapy" on Google scholar - https://scholar.google.com/ and came up with a lot of information. Here are the search results - http://bit.ly/2nZSx9f. You can also refine by using the links on the left to show by dates and more. You might be able to do a search there with different keywords and find some information more relevant.

Good luck!
John