I'm sorry I don't have any good advice but I want to say that you are a very loving daughter and I applaud you for all that you are doing for your Dad.
I just wanted to add that be careful giving him grapefruit seed extract. I read that it can interact with many meds. The other point would be being allergic.
http://www.ehow.com/info_8013484_gra...eractions.html
http://news.ca.msn.com/canada/grapef...-can-be-deadly
I hope you'll find something that is beneficial for your Dad.