You're looking at it the wrong way. They don't grant you SSDI for having a disorder. They grant it to you for not being able to work. The pertinent question is: "Does your panic disorder make it impossible for you to work." If you can make a convincing argument that it does, then you can get SSDI.

First you have to have a diagnosis from a doctor. Second you have to have a history of being treated for this disorder. Third you have to demonstrate that, even with treatment, you were unable to work.