iPhone went from boot-loop, to dead, to unresponive and not charging.

My iPhone suddenly turned off today, and upon turning it on, it became stuck in boot-loop for about an hour before it died, showing the dead battery and flashing charger icons. I plugged the phone in and for a second, it showed just the dead battery logo, indicating that it was charging, but then the screen went black and didn't turn back on, even after charging it for three hours. I've tried three different cords into three different outlets and tried to force-restart the phone and enter it into recovery mode numerous times with no changes. I have an appointment scheduled to have the hardware looked at tomorrow, but I was hoping to find another solution in the meantime. I really just need to get the unbacked-up photos off of the phone, the phone itself is not very important to me.