Would lyrica (pregabalin) or amityripiline be more suitable for gad, many thanks?

Not clear: Neither is used first line for GAD, so it is hard to say which would be better, it either at all, as it is somewhat based on the individual. I have used amitriptyline for anxiety with a headache disorder. Pregabalin is first line for pain, specifically neuropathic pain. Your diazepam should be helpful for anxiety. Please speak with your provider or make a virtual appointment.