He was shocked from the moment when he knew he was not entitled to medical assistance in dying to the moment when he decided to request palliative sedation. Between those two moments, he was angry and he was very anxious. He was shocked that he did not have access to it.
Plan B, palliative sedation, calmed that anxiety. Once he made the decision to request palliative sedation—to be put to sleep—it worked for him. It was the state that it left him in for 24 hours that was difficult. In fact, he was already at the end of life. He might have died the same day anyway, even if he had not received palliative sedation. He was completely at the end of his rope.
So yes, he felt angry for a while.