Barb,
I agree with Karen, order another pet scan and so forth, also he may be depressed,,, very common after this surgery even if your test shows nothing.
The age has something to do with it as well,, here we are in our 60's and boom we get blasted with this, for men its very upsetting,what also works on there mind is the sexual funtion, or lack of it.. I don't know your dads situation but at 62 I am sure he was still able. But now not,,its hard to live with that fact as a man, this is a sensitive subject and one you may not be comfortable with dad, just remember for him its an issue, maybe? Emotionally its a real hit on them...
The massage thing sounds good, but I would clear it with the doctor first,,just to be safe,,that may sound weird but I had an experience with my dad having one after open heart surgery,,,he got a pedicure instead....let us know whats next, I am sure he can beat this,,,Take care ,,Ginger