In your first post in this topic you wrote: "I'm scared that this damage to my brain is permanent". I hold a degree in psychology and - trust me - in a 16-yo brain there is
nothing permanent (although there's no need of a degree to say that..!). That's way I asked for your age
Then you wrote "I'll be able to change it for the good faster" - yeah, that's the way it works ! Don't make your fears speak for you!
Then, your bathroom is a trigger! My friend, you must develop a strategy. You may start by not taking with you your smartphone or tablet or whatever when you go to the bathroom. There is no need of them
take a book instead! I think change our habits is always a good strategy. I know it's hard, I'm still working on that.
You are on the right way, trust me!
Ps. sorry for my english, I know it sucks :-\