I'm a Christians yes. It's very late, and although this is going to be my first post on this forum, I'll try to give my spin on this very important and also very difficult subject.
Heaven and Hell are with us always. Heaven is the Kingdom of God, which exists within us/with us/ through the Holy Spirit. It's the relationship we share with the divine. Hell then, is the total absence of God in our existence.
Remember, that's what I think only, others might interject here and disagree, which they have all the right to do.
If heaven and hell is a quality of spiritual being, then that can be here in life, and after life. To bring yourself to suicide and to abandon hope is, in my view then, obviously the absence of God, ergo Hell.
"You are already in hell if you commit suicide" would be the distilled answer.
Do you stay there after death? I don't know. What I do know is that I trust in the Lord to be good and just. I trust he is love, and I know he would never abandon anyone to hell against their choosing (them choosing hell over heaven by actually clinging to it, loving it more then God). (As a Wesleyan, I do believe in free will, but that's a whole different animal).
I hope that viewpoint helps a little, I am very tired and I am bound to have spelling and syntax errors in this post. I'm looking forward to more posts and I am very happy to have found this forum.