Withdrawal from Lyrica did a number on me, I’m 8 months out. It gave me severe anxiety which I am still struggling with, panic and agoraphobia. But I’m making it with counseling. I’m now using CBD oil which is helping a lot, maybe your father could try this. Prescription medication takes over our system and it’s so easy to depend on it. In the beginning of my withdrawal they gave me Ativan to help but I weaned myself if it and just using the oil. It has been rough so I can understand how your father is feeling. There’s a group on FB about CBD oil if you have an account there it’s worth signing up for to read about people’s adventures and advice they share