Based on the information provided you are having flickering in eyes and now able to close the lip, its very good sign and strong reason to believe that you are IMPROVING.
In bells Palsy
is being compressed or injured , but in your case its seems like it got COMPRESSED and the STEROIDS
will help REDUCING the swelling leading to get the nerve back to it original function.
Here is some information about nerves, I think it will help you in understanding it better, nerves are like electric wires which conducts electricity form main switch to appliance in the same fashion the nerves collects information from surrounding and sends the information to brain to analysis, for example if you put your leg in fire, the nerve will say its hot, the information passes to brain and brain will reply to remove the leg from the fire its very fast process, as it happens in fraction of second.
Hope it helps.