Lexa
The only way to break down your wall is to take it apart the same way you built it, brick by brick. Your wall probably took many years to build, I know mine did, so this is something that will take time to do but is essential to your recovery. As my psych once said to me ' Get yourself out there'! I know its hard but this needs to be attacked 'face on'.
It also takes a lot of strength and courage that we don't realise we have until we put it into action. Attempt one brick at a time, take a deep breath & go for it, work on it daily, ring a friend, say good morning to a neighbour, have a friend round for coffee, then praise or treat yourself each time you achieve your goals. I dread to think how many slices of cake i've eaten in the last year but rewarding myself has helped me to understand the importance of being kind to myself, even if I have put on a few pound in the process!
Good luck with your 'wall', there are always people here to talk to, you may even find a ptsd sufferer in your area, peer support is so important to get you through this. Feel free to PM me if you would some support, my wall is much smaller now!