camera flash not working after 14.6 update and battery life also exhausted

Hello,

Start here:

If the camera or flash on your iPhone, iPad, or iPod touch isn't working

These are the standard steps for short battery life:

1) Have you tried a restart?  If not, do it now.

2) Go to Settings > Battery > BATTERY USAGE BY APP to see the apps that are consuming your battery.

3) Check “Battery Health” in the link: 

iPhone Battery and Performance

4) If all else fails, consider a battery replacement:

iPhone Battery & Power Repair

Good luck.