my best to you and your dad ... I'll keep the positive energy flowing his way ..
Listen, there are a lot of holistic, herbal type things you can do. Its best to look into this and see what is possible. No links now, but I will check with my wife when she comes home...she knows some about this.
also, I'm sure you know, but some medicinal THC can help a lot.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854