Whats happening is that multiple afflictions are happening at once.
The OCD is feeding the anxiety which is feeding the HPPD and dpdr.
As a fellow sufferer of ocd you need to try whatever you can to get a grip on the illness.
You are not going insane.
This is not going to last forever.
It will pass and you will be able to move on with life.
Every time an objection or counter argument comes up, politely accept the thought as being there and tell yourself that youre recovering and recovery takes time and that you will get better.