Final dentures with snap in installed 4 days ago. Cannot reinsert top denture

Lower implants and denture great.upper gum swollen and bleeding where denture cut into upper under lip and nose. Bone has shrunk on upper. Cannot get denture snapped on posts at all. Need to know how to reduce swelling, heal gum?? Is getting a longer hole attached to denture so it can be installed to post an option? I see dentists in 5 days and need to know options and how to heal and control pain meanwhile.