Journaling works the same way for me. Once everything is out in the open, not in my mind, I can relax.
You mean writing down your thoughts, like a diary of some sort? I've tried that once, didn't last more than a day. It feels stupid. The only thing I write down is an idea or something to-do that either will be done after some other thing or I have to remember, for projects and real-life-go-to respectively.
Who do you talk to? That probably makes a difference.
Doesn't matter who, I can either type a chat message to someone on Steam, Skype, MSN, forum, etc., or if relating to how it was before, I could call up someone (once again, anybody) on Skype and talk. It absolutely doesn't matter who, I could probably do it alone, but it feels awkward to talk to myself, so I don't do it, especially when I have alternatives.
No. This is a Te trait generally, not Ti. I used to do this when working in groups, when younger. Where I'm at now I can't do it.
Paul Erdős was definitely an INTP, and he would collaborate with other mathematicians, supposedly by thinking out loud with them. But he didn't have a wife or family and that was his only social interaction. So, depending on circumstances, it is possible.
Speaking of groups, in groups I would be more likely to shoot off the ideas of the other members of the group, rather than talk through what I think.