Sounds like he smoked a very potent sativa strain, possibly too much, and in the wrong mindset.
Indica is the more dreamy, relaxed, sleepy high that he smoked first. It simply has a higher ratio of certain cannabinoids vs. other cannabinoids.
The second batch sounds like "dank" weed, which means very potent, very desirable stuff. However, it was probably a more sativa-oriented variety.
Sativa isn't the same type of high, it's clearer, less sleepy, slightly more trippy. Your patient most likely should stop smoking this type, his high is never going to return to the previous one unless he attains a more indica strain.
Also, a very good rescource for you and your patient: Erowid.org. Very organized, up-to-date info on all drugs, and the cannabis section is a very good one.