At this point, speech may not even be your main problem any more. I don't know you, but from what you've written, you're so tied in a knot with anxiety and self-medication, you'd still be miserable even if your stutter magically disappeared. While it's still free (with tuition), take advantage of on campus mental health services. You might benefit with some regular therapy. It won't "fix" your speech, but dammit, if you're going to stutter, you might as well be happy.