While I agree that comparing your degree of illness to another's may be counterproductive, let's take a practical look at your list.

First, you have two diagnoses, so you'll have symptoms of both disorders.

Second, you have essentially duplicated some symptoms by giving them different names or breaking them down a step. For example, depersonalization and derealization are both types of dissociation. Hearing voices in your head, assuming you don't have DID, would be considered psychosis. If the voices were from DID, then that would be under dissociation. So, if you go through your list and cross out things that are redundant, you may find it is much shorter.

I think your T was a bit out of line by saying how "long" your list was. Even if it was long, what he essentially did was say, "wow, you really are nuts" - uncalled for. I don't know if the list you gave us was the same as what you gave him, but I don't see anything that would be considered unusual given your diagnoses, except perhaps the cutting. That may be part of something else, but as far as symptoms of PTSD and bipolar, the rest of it doesn't seem at all excessive to me.