Suicide mean the end of this body's existence and the curtailing of further potential experiences it was capable of. I don't think there is any punishment for this on the other side at all; there are a hundred miserable ways to die so why would anyone be singled out for how they went? Why punish someone already in so much pain? Is not suicide just one more way to become a victim to circumstance before your time is up? Some religions claim different but they claim a whole lot of other things I don't buy either.
The only thing necessary for the triumph of evil is that good men do nothing.