Ethan, I know exactly how you feel: I'm going throught the exact same thing.
All I can do is agree with what everyone has already said: You're going to need to talk to someone about this, and if your partner is the only one you can trust, then you'll have to talk to them. keeping these emotions bottled up isn't going to do anything for you: it's going to make things worse, no matter what you think.
I don't know if I can suggest coming out, really. As I have not done that yet, I don't know what it's going to be like. But I CAN say this: if you dysphoria is so bad, that one more day in your current body might mean the death of you, you should not force yourself to keep pretending to be something you're not. I don't want to see anyone hurt themselves because they couldn't get the help they need.
I'd suggest anti-depessants, like Beth said. I currently take some, and while they don't help with my dysphoria, they certainly keep me from just laying on the floor and crying for hours on end about it.