It doesnt matter how long youve had an anxiety disorder, you can still reverse it. The only difference made by time is how ingrained the habit of freaking out is. But having an ingrained reaction to things does not mean your stuck with it forever. Anxiety is totally managable. Its the dpdr that is sticky. And many people recover from dpdr after managing the anxiety they have but not always the case cause something else might be causing it.
i dont know what causes my dpdr. thats the problem. i know i have anxiety but after i had did it to overcome my chronic dpdr i had gotten so often panic attacks and despite i did not relapsed. my current case is very very weird