HELP!The phone doesn't turn on,charging isnt working,pc cant see it

Hi

I hope somebody can help me...

This morning I turned on my z2 (fully charged),the camera was malfunctioning so I switched the phone off.

Later I tried to switch it on,the sony logo apeared and it states like that for hours.

I held the power button and the volume up but it didnt work.

I tried to use my computer and afer an hour the phone switched on,it was glitching but it worked...

Unfortunatelly it didnt last long,now my phone is dead the notification light doesn't work and it is not charging...

Now the pc cant see the device.

I have 16000 photos on my phone I dont want to loose them.Please help!