I have the same problem, but there's only two things you can do.
1. Wait a day,or two, or maybe 3 and plug your charger on. Thats what i did. i think its basically needing a break cause of how long you run your phone without powering it off much. Or other things its just too hot and needs to cool off.
2. Take it somewhere like a lowkey place where they fix ipod,phones, & etc for cheap prices instead of going to apple cause apple is gonna give you the dumb response you dont wanna hear which is "I cant help you, gotta buy a new one". <- example.
Contact my email @ shaylarodriguez10@yahoo.com if you want free repair for your ipod, iphone, or whatever needs repaired. I check my email everyday soo...