Hang/lie heavy
Definition 1 of 3
Pro Tip 1/3Conscience Stricken
Used to emphasize moral weight or guilt someone feels. 
After stealing, the guilt lay heavy on his mind, even in sleep.
Pro Tip 2/3Metaphorical Weight
Describes problems as if they're a heavy physical burden. 
With the scandal unveiled, shame hung heavy on him.
Pro Tip 3/3Persistent Issues
Used for problems that continually cause worry over time. 
The unresolved mystery of the missing heirloom lay heavy in the family.