Hi all.
Sorry for the delay in replying. Thanks for all the kind words and common sense. My biggest takeaway was my reactions were more about me wanting to fix something in someone else that I had no control over in me, because he's my dad.
It took a bit of reflection to realise his situation is very different to mine so my worldview does not apply and more importantly, he has autonomy. I'll just step back and let him play it out how he wants.
To add to this, one of my closest friends has been Dx's with cancer of the lower esophagus with some lymph node involvement. He's doing what I did, hitting Mr Google so I advised him to ease off until he knows more, a lesson I learned the hard way. I gave him some other bits of hard won advice too, so at least something positive came out of my journey.
Getting two people I care about being screwed over by cancer in short succession is quite a kick in the bits, and a little bit of survivor guilt is starting to creep in. Gonna have to s*** that down fast so I can keep on an even keel to be able to help them.
Obligatory **** cancer.
Cheers, all.