Since the patch [latest to this posting date] that was released to fix a number of bugs, Balances, and exployts I have Knowticed 1 thing. Even in easy mode the enmies have become super fast, and vertually indestructable. Expls: Ghouls that are tuffer than Deathclaws, and just as hard to kill. The Legion's Assassination squads appear ever 60 seconds, and they took down a deathclaw in 3 seconds. They are even tuffer [individually] than the Feral Ghouls. When a feral ghoul slaps me I get thrown 20 feet , and befor I can recover they have run the distance and hit me again.

The main reason they have become so horrid to kill is because thier damage reduction is in the 90% range. That and thier accuracy is nearly perfect with every shot. Expl: At range of approxamatly 107yds they hit with most every bullet fired from a 9mm subMG [doing max to crit damage each bullet]. Yet my Hunting Rifle scopped in the kneeling possotion hits most of the time doing 1-5pts damage [ 10-15 on a cinematic crit]. This much damage only removes 1 health block.

REQUEST

How do I UNDO a patch?

I want to rollback to the previous patch where things worked well [tuff but well]. And how do I turn off the AUTO PATCH?

The last patch as far as I know was release last year in July. The patch alone doesn't do what you're describing.
Have you verified your game cache?

Are you using any mods? It sounds like you are. New patches can mess those up horribly.

Either that or your save is messed up or you've been fiddling with the console.