What is happening in Syria

The Syrian regime is losing ground so fast to the Armed Opposition and this time Russia, Iran and Hezbollah are all busy with their own issues and wars, Syria's Alassad might have to figure this out on his own and some say he might not make it this time! Even his own faction and inner circle are losing trust in him.

I'm honestly a bit confused about what exactly is going on and some resources say that ISIS are doing some things in the background and Syria is about to explode again.