My husband is 68 and was diagnosised with alzheimers two years ago, he has done very well and is currently on both donepezil and Namenda. He has complained recently of more anxiety and frustration. He is very alert in the morning but struggles as the day goes. If I ask his doctor to increase his medications would that help with his anxiety and frustration? He says he feels “on the edge” a lot. He is a very low key, quiet man. Any suggestions?