Have you thought about buying another car/truck so you could drive something reliable while you fix your truck?
This is how I ended up with all these trucks hee hee
But you've come to a forum that is made up pretty much entirely of people that have made the commitment to keep their trucks (plural mostly) and so we are all enablers hee hee.
To someone on the Rust Belt, most of your post has me in tears.
But being an enabler, truck hoarder, rust fighter aside, I also think you just need a breather, and it looks like you have already done your pros and cons list and I don't see a good argument for selling.
I have been in same spot, where you ask yourself, JFC, when does it stop? But then I remember the recent sticker shock my husband and I had when we went shopping for a new F450 last year and I realize that even if I spend $100 a month here and there on parts and a few hours of my life, it beats the crap out of parting with $80+k of hard earned savings, plus insurance, plus Ford's diesels aren't impressing anyone right now