How can I help my dad with his anxiety after his stroke last year?

My huband had a left neglect stroke last July 2010. SInce that time he has been in and out of hospitals and is currently in an assisted living for Alzheimers. He has dementia but mainly suffers from high anxiety. He is currently taking Buspar at night for anxiety and to sleep, but he experiences anxiety during the day and Sundowner's syndrome. I do not know whether to have him evaluated by a neuro-psychiatrist, neurologist, or a professional that deals with anxiety in general. He has been on psychotic drugs for the anxiety which left him sleeping and in a stuper for days, neurologist had prescribed Nuvgil which made him more anxious. I cannot get any professionals to help me to help him with his anxiety. He has always been anxious but after the stroke his anxiety has been more extreme than ever.