I've read and heard enough stories about the dead communicating with the living (through dreams, mediums, other signs) to believe that the consciousness lives on after death. It even happened within my own family.
With that belief, my position on whether I would regret suicide is this:
- Have I tried everything possible to fix whatever issues (physical or mental) that is compelling me to suicide while I'm still alive?
- Is there truly no hope for things to turn around?
- Is the pain unbearable?
If my answer to all three questions is a yes, then I can say I have no regrets of suicide despite what awaits me on the other side. If there is a "no" to one of my questions above, then I owe it to myself to try and make things better now rather than in the afterlife, since there's a chance I would still have to deal with it then.