Recovering data from Bootloop?

Hi all,

First of all, my phone is completely vanilla, no rooting or modifications were done. Running 5.0

Here's my situation:
After fully charging the phone yesterday and sending some messages on whatsapp, I drove out to get food and while on the way there, the phone blacked out. At first, I was able to get to the colored dots loading screen but it would always get stuck there and shut off. Then I keep trying to restart it up and it got worse and worse, now I'm always stuck at the GOOGLE screen. I'm not sure if this is a boot loop issue as it just gets stuck at GOOGLE screen. I tried the recovery mode cache wipe and it gets stuck at the GOOGLE screen in the middle of the wipe, or blacks out.

So this morning, after fiddling around the power buttons some more, I am able to get the battery logo while charging, though it is weird that it shows 100% then completely drained the next minute or so. I try to load into the recovery mode again and this is what I see at the bottom

E: failed to mount /cache (invalid argument)
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: failed to mount /cache (invalid argument)
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: failed to mount /cache (invalid argument)
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: failed to mount /cache (invalid argument)

Am I screwed? I'm not sure what to do at this point.

Today, I am stuck at the colored dots boot animation but after smacking the power button side a bit, I'm back to being stuck on the Google screen. What's worse the recovery mode can't be maintained on the screen as it blacks out after 5-10 seconds. What can I do at this point?

I was going to use WUGfresh to reflasth the ROM but I think this wipe all data on he phone? Is there anything I can do at this point to retrieve all my apps, photos and what not? Nothing is backed up.

Any tips or advice would be greatly appreciated.

Thanks