Oh my,
I won't get started on Facebook, but I think you did a positive, healthy thing in deleting your account if it was causing you discomfort of any kind. Since you're feeling so awful about yourself, I did just wish to reply to your post and say that it's very, very easy to be way too hard on yourself and start labeling your actions negatively.
My 78 year old mother has an account so she can see family photos, etc. Facebook can be a nice thing but can also be used as a weapon by people who wish to spread envy or discontent. Even if this hasn't been the case with you, the fact that your account wasn't a healthy thing in your life means you did well to delete it. If it's important to you, perhaps creating a new account when you're feeling better would be symbolic for you of a new way of looking at life, as long as it's genuinely postive social outlet for you. I don't mean to sound so preachy, an of course could be wrong, but it just sounded to me like the right thing to do, given how you were reacting to Facebook.
I'm sorry you're having such an awful time of it, but it's actually a good thing to have been able to verbalize how tired you are of having this intrusive PTSD 'control' so much of your life. Everyone is different, but I know for me, just plain being sick and tired of being sick and tired ( to use an annoying old phrase) has gotten me motivated to some path of actively seeking help in the end.
I hope you find some peace here, at least, and take care,
Anni