All akathisia is "internal" (with external symptoms too, like pacing). When I got it from Abilify Cogentin worked, but not until 3mg, which gave me vision side effects. It went away when I stopped the Abilify. Latuda at 40mg brought it back. This time we used propranolol. That finally worked when we got up to 80mg (and I still added .25mg of Cogentin until recently). You don't say at what dose you're taking the propranolol...? I didn't find benzodiazepines to be helpful at all.