Sorry for your experience. You did not say what model year and how many miles you have. The pre-facelift (pre-2004) and post facelift V8s have some differences in their common problems.

But regardless, you've had way more than the average number of problems one would expect with this model. You did not mention CPO so I am assuming you got it as a private sale. For all you know, the previous owner abused the crap out of it and did not do sufficient miantenance and TLC. Or maybe the vehicle plunged into a river and got fished out (which would explain all the electrical crap you're dealing with). Did you run a Carfax history?