Hey hi, please don't worry or feel depressed. Getting crowns is 100% the right decision to protect brittle, root-canaled teeth from breaking completely.
Next Steps
Take the painkiller/anti-inflammatory medicine prescribed by your dentist.
The pain will settle down beautifully once your final crowns are permanently cemented.
Health Tips
Avoid chewing anything hard or extremely hot/cold on those specific teeth right now.
Keep doing warm saline rinses to heal the sore gums.