Diazepam(valium) is a benzodiazepine anxiolytic used in the treatment of anxiety disorders, seizures, and muscle spasms. The effects include, muscle relaxation(jello-like feeling), dizziness, drowsiness... Im assuming this is your first time experimenting with diazepam, so I suggest 10mg.
Blue = 10 mg
Yellow = 5 mg
White = 2.5 mg
As for propranolol, im don't know much about it. Sorry...