Well guys, you know you are always free to come on these boards and rant to your heart's content, so please do whenever you like 
As for the therapist, IMO any therapist that won't believe what their client is telling them is not worth seeing. You could try finding a different therapist.
However its worth noting that if you try to approach your emotions and fears head on then you may run into a road block, of sorts. Try working around the edges of the problem. In all honesty and in my experience the problem in DP is not wanting to deal with all the little issues we have in our life. Instead we choose to ignore them as though they don't matter and instead focus on this massive existential fear. Well, if you do that then you just put yourself into a very powerful place that you have difficulty escaping from.
Here is what I recommend. Next time you see your therapist, start very small. Start by talking to them about how you got angry when someone cut you off in traffic, or bumped into you in the street. Tell them how your parents called you at an inconvienient time or something that seems so minor and insignificant.
In my experience, if your therapist is good then they will help you gradually follow these threads and over time unweave a very complicated tapestry of how these problems have built up over your life. You'll be very surprised to see where these seemingly insignificant annoyances actually come from in your past, where they originated and how they have grown over time.
Also, by actually dealing with these "lesser" problems you will probably find yourself feeling much better overall, because you are breaking your issues up into smaller, manageable chunks rather than trying to shove a whole watermelon in your mouth
Also, I too had the problem of not being able to express how I felt in from of my therapist, so I think its probably normal. Take it slow and at your own pace and try to get your therapist to work with you.
As for the therapist, IMO any therapist that won't believe what their client is telling them is not worth seeing. You could try finding a different therapist.
However its worth noting that if you try to approach your emotions and fears head on then you may run into a road block, of sorts. Try working around the edges of the problem. In all honesty and in my experience the problem in DP is not wanting to deal with all the little issues we have in our life. Instead we choose to ignore them as though they don't matter and instead focus on this massive existential fear. Well, if you do that then you just put yourself into a very powerful place that you have difficulty escaping from.
Here is what I recommend. Next time you see your therapist, start very small. Start by talking to them about how you got angry when someone cut you off in traffic, or bumped into you in the street. Tell them how your parents called you at an inconvienient time or something that seems so minor and insignificant.
In my experience, if your therapist is good then they will help you gradually follow these threads and over time unweave a very complicated tapestry of how these problems have built up over your life. You'll be very surprised to see where these seemingly insignificant annoyances actually come from in your past, where they originated and how they have grown over time.
Also, by actually dealing with these "lesser" problems you will probably find yourself feeling much better overall, because you are breaking your issues up into smaller, manageable chunks rather than trying to shove a whole watermelon in your mouth
Also, I too had the problem of not being able to express how I felt in from of my therapist, so I think its probably normal. Take it slow and at your own pace and try to get your therapist to work with you.