The first that comes to mind might help with his eating/pain would be Cannabis, since his throat hurts a lot, mixing it into brownies or something not requiring smoking would seem a good idea. But if he's unable to even eat, getting the TLC into his system sounds like a real challenge.
Now I know thats not a great solution, there are people who have suffered through cancer and have had great relief from that, there are studies to support it so thats not really alternative medicine.
As for eastern medicine, be weary, anything claiming to help cure cancer or help make it better from alternative medicine has no scientific backing. I remember when my mother was suffering from cancer my sisters were also looking into anything hoping to help ease her pain.
My sympathies to your family and your dad dude, the helplessness you feel is so hard to handle and I hope there are better suggestions than mine somewhere to be found.
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