Massive Software Problem - Possible Virus?

Having lot's of issues with my Samsunng mobile phone at the moment.

It's been happening ever since I got a notification yesterday telling me someone in America had tried to log into my facebook account via Google Chrome.

I keep getting phone notifications saying that apps have stopped working (mainly Google related apps such as Google Play etc), I can't see any of my phone contacts, it's just syncing constantly and in my message centre I just see the numbers and not the names of the contacts and no matter how much memory I free up on my phone (and I've deleted at least 1GB of photos, music, videos, text conversations and apps since the storage message), it just keeps saying my storage is full and my messages are full and no space is freed up. It's like the deleted data is being stored somewhere.
The phone also gets really hot and the battery drains very fast and then takes a long time to charge back up again.
It was fine up until yesterday and I haven't done a software update in a long time.
Any advice is welcomed and I am trying to Google on my laptop how to fix these issues but so far nothing has worked.
I really don't want to have to do a full system reboot and risk losing everything on my phone as only some of it is backed up.
I just need to survive with this phone til the end of Nov when I'll be due an upgrade.
And right now I am off work with a knee injury after a bike accident so I can't walk to go into a repair shop and I am expecting calls from the hospital any day now about my physio so I need to make sure my phone is ok.

Please help!

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