One can be in the kingdom of heaven and be suffering. The reason, he or she has not come to grips to what the kingdom really is. They have been stuck or retard to a theoretical perception of what the kingdom aught to be, not what it is. And so, have fall into various hurtful and painful sitiation.
To be saved is to change ones attitude or behavior in regards to the fire, in that, we will be saved in the kingdom of heaven.