You got fluent when yelling/swearing/angry bc it used enough force to override something called valsalva maneuver which is automatic reaction to fear that clamps shut vocal chords. Please do not use techniques that have you thinking about your articulators as they are NOT the issue, and it will ultimately make blocking worse. (The actual issue is anticipatory fear causing diaphragm to tense up ) Everything you describe is pretty much standard for dysfluency (including that speech therapy was useless). Most aren’t trained in it and treat it as if it’s articulation disorder, which it’s NOT. If you want, there are some free links that will explain the proper type of hard work you need to do to gain control of your speech