You are taking the use of Gehanna literally. How do we know that Gehanna is not being used metaphorically as a representation to provoke an emotional visualization of real conditions in an actual Hell?
How do you interpret
> Mar 9:48 - Where their worm dieth not, and the fire is not quenched.
Other than that "the worm" the cause of death, decay, and suffering, never ending, and thus the suffering never ending?
A while back I looked into what the Bible really seems to say about Hell in the hopes that something so evil could not have been written there, but I think ultimately any interpretation that leads to the belief that the Bible doesn't describe a Hell as it's commonly understood is just wishful thinking.