Hi, from the history what u r giving , it seems that there is a gap b/w the cap and the adjacent teeth.
Food impaction is taking place , causing swelling leading to pain / bleeding gums.
Continue doing warm water with salt rinses 3-4 times daily , and also apply Tan x gel over the affected area .
Avoid eating food from that side.
Most importantly , KEEP THAT AREA CLEAN.
Rinses/ Brushing / floss / interdental brushes or
aids.
Next Steps
visit ur Dentist when Covid problem is controlled.
Get ur said crown or cap changed .
Health Tips
keep the area clean.