Ban Xia Hou Pu Wan

If his underlying diagnosis in Chinese Medicine terms fits, then yes certainly ban xia hou pu wan would be appropriate - see “how to choose a formula” for more on that. There are many diagnoses in Chinese Medicine, however, that can technically be called “anxiety/irritability” - so you choose the formula based on his TCM diagnosis, not the end result/symptoms/conditions.

Certainly what he has is very commonly treated and resolved with both acupuncture and Chinese herbal medicine - I suggest you see a licensed practitioner in your area and give them 2-5 months to get him in a much better place.