Does anyone else have a parent with Frontal Lobe Dementia?

I'm at my wits end with him and situation. He seems manic and lucid at times? He will spend months and months on the couch - sleeping, eating and watching TV but then seems to have a manic phase where he seems somewhat more cognizant and mobile BUT paranoid. He hasn't handled his finances, got groceries, scheduled appts. or picked up meds in almost two years. In January of 2011 he was found in the hallway of his highrise apt. building passed out and was hospitalized - he has continued to decline from there. March or April of 2012 he was diagnosed with Fronto Lobe Dementia. I am hitting brick walls with his general Dr., senior/elder caseworker and the housing authority - in his manic phases he has them convinced I am the bad guy (girl). Has anyone else experienced these manic phases with the fronto type dementia?