As someone with the same affliction, I think you're right that slow paced movies are hard for me to enjoy. But they don't need to be fast paced either. They just need to be captivating.

Fellowship of the Ring is an excellent study in pacing, and it's not (always) fast paced, but the whole movie is captivating so even in the slower parts, I'm still in it.

Female wallabies have three vaginas.

This is how I like to look at the progression of time. It's much simpler and consistent, in a lot of ways.

It really depends. I'm guessing the whole house isn't at 13, and the bathroom is on an exterior wall that sunk and the structure of the main floor results in the bathroom seeing the most of the slant. If the whole house is at 13 degrees I would be weary about living in it.

You need to fix this at the foundation before you do anything else.

13 degrees is a lot and is indicative of foundation stability issues. Before doing anything, you should verify that the foundation is currently stable, even after 100+ years it could still be sinking slowly, depending on the makeup of the ground below it. You level the floor, remodel the bathroom, and in 3 years you start to see cracks from the foundation sinking another 1/4 inch. There are ways to stabilize foundations that are not currently stable.

Additionally, I suspect mudjacking your house may make the most sense. This involves lifting the sunken part of the foundation up a bit and filling in the gap. This will naturally level out the floors and provide the most structural integrity overall. In some cases it's not as expensive as you may think and should be well worth it if the foundation has finally settled. Not only are your floors more level, but your house is more structurally intact overall. The downside is it's going to cause cracking in existing drywall, plaster, flooring etc. that was placed according to the sunken angle of your house, but like you said, it's a fixer upper, so presumably you're poised to do that work anyway.

At some point a house leaning due to a sunken foundation is dangerous, so it should not be taken lightly. The leaning tower of pisa is leaning at 4 degrees. It is 6 times older than your house and still sinking for the same reasons your house may be.