I don’t even know how to begin ignoring my obsessions. I know that’s the only way to get rid of them, but I just don’t feel like I can. My habits are out of control. I can’t even use the bathroom in my own house without REALLY REALLY bizarre rituals.

The key isn’t to ignore because when you ignore, your obsession gets bigger and bigger. Instead try to face the fear and anxiety. An exercise that works is before you take part in your rituals, set a timer for 5 minutes and when that timer goes off, then you can go forth with the rituals. It doesn’t give you as much temptation urges then just trying not to do them at all. You want to do them after a certain time. Be sure to increase your time but seconds or minutes every time. Hope this helps. Eventually it will get easier to let go of the anxiety around whatever you obsession is.

i feel :/ i don’t know how i could possibly ignore or resist the compulsions to check my environment when i’m alone when the intrusive thoughts are basically telling me i’m going to die or am in danger every 5 minutes

Exactly. I feel so contaminated.

And keep a diary where you write down the time, the thing that started your compulsions and your rituals. It will help pinpoint what things set you off the most, and slowly start waiting more time for those. For example I used to wash my hands every time I touched fruit. Pinpointing it and not thinking it was just another thing from the kitchen helped me, I started with 5 minutes, then six, then seven etc. When I reached ten, half of the times I was forgetting about washing, and now I can eat and touch fruit without freaking out?