I don't usually have a problem writing papers. I chose the non-thesis option, though, because of time constraints. My grad scholarship requires that I teach undergrad courses 12 hours a week plus my own classes.
My suggestion: spend time with your advisors and tell them you're stuck. They have been there and done that, and in my experience, they are extremely helpful. Frankly, a therapist is useless on this matter. Let me know how it works out.
Susan