Jimi I have to disagree with you , I have found that you too write thoughtful and purposeful post here.
I too have trouble letting people get close to me, not just out in the world but here on PC. I don't PM much and the form where you post to friends is difficult for me. I tried chat a couple times but I felt too vulnerable there and haven't been there in years. For me I've noticed when I'm feeling vulnerable I get more fearful of getting hurt. Then usually a couple things happen. One is that my responses get shorter, I tend to project paranoia into both what I write and how I understand what other are writing. I once was gone for a year from PC.
I've never been part of another web site, mental health or otherwise, no fb for me I'm not that brave. If you needed to take time off I belive that most of the people on this site will understand. You are welcome.