Hi Katie, I hope you can see from all the replies that you are not alone with what you're going through.
i also get excited when talking about DBT (dialectical behavioural therapy).
i was diagnosed with borderline personality disorder 4 years ago. I swore nothing would help me but DBT has! Also I found people in the group that I didn't have to explain myself to. We now see each other regularly.
ive never been any good at relationships and have always felt like a bit of an outsider but through these skills I have learnt that although friendships are ok, we all do it differently. I'll never be one to have afreindship that everyone else seems to have but that is now ok.
talk to your psychiatrist and ask her/ him for advice on talk therapy sessions, perhaps have a look first on the net and jot down what you think might be useful for you. Also take notes during your session so you can remember what has been discussed. Dbt was right for David and I it may be that a different talk therapy might be for you.
Re. The letters, post them in a box and put the box in the attic or somewhere like, keep writing them. Decorate the box if you want, make it personal.
as far as how you feel when you relax, you have to persevere with this one. Start by finding what you perceive as a safe place, I started in a cupboard and has now gone to a safe imaginary place in my head that I can carry with me wherever I go. Bombard your senses, for me it's a mug of hot chocolate, some soothing classical music, insincere sticks and a cuddly toy, whatever you like really. Just try to be still just for a few minutes. Try to accept the way you are feeling, you might be scared but accept that you are this is you now and you and how you feel are very valid.
enough of my ranting!
we are here, write on this forum as often as you like. Coping with living will happen to you, not at this moment but there really is hope.
my dog, Alice is my saving grace, knows how I feel and gets me out of the house.