iPhone 6 Randomly restarts after drop..turns on when plugged in.HELP!

I recently dropped my iphone 6.It restarted immediately when it fell down.Then it came back to normal but when restarted ,battery showed 1% phone becomes slow then battery changed to normal with no lags.After 2 minutes iphone restarted randomly.after 2-3 days it ended in BOOTLOOP then i managed to get back by pressing home and volume.Then it turned on only when pluuged in but still restarted after 2 minutes even when plugged in.Now a new problem appeared sometimes it wont show charging indicator even when plugged then sometimes it may go to 100% but the phone still rebooted randomly.I tried to restore through itunes but it restarted while restoring.Now its bricked!!.WHAT WILL BE THE REASON FOR THE PROBLEM? BATTERY HEALTH WAS LOW 72%.IS IT THE BATTERY PROBLEM? PLEASE HELP!! SORRY FOR BAD ENGLISH..HELP ME