I think you will find many of us here get exactly what you are saying because we have felt that way in one way or another.
I get the feeling of ' not sure how much more my brain can take'!
I've been there to many times to count.
Like Pete Zahut said, Staying in the NOW helps a lot. Also don't be afraid to call a hotline. I've had to many times and it helped. ( just a note on that as I have much experience with calling hotlines, sometimes you may get someone that is flippant, or abruptly hangs up because of time constraints or the caller they had before you is literally out on a ledge and called back and they have to dispatch the call. If that happens 'no one ever warned me that it could , so it took me by surprise and hurt me',) ...simply call back.
Definitely try finding a therapist asap. In the meantime and during please do come here and share your feelings, as many here can relate.
In time and perhaps not so very far off in the distant future you will find that you are stronger than many people around you because you went through this.
I have friends that would crumble if they had even 1/16 of this happen to them. That fact alone makes me feel more empowered within myself.
The feelings of wanting to die considering what you are going through/have gone though are absolutely normal. It completely sucks on every level.
Please do reach out here.
Caves