Tinnitus Started Out of Nowhere — Why Does It Come and Go Day by Day?

My name is John and I stumbled here by looking for reasons for my tinnitus. Just over a week ago my left ear started ringing pretty bad. It would ring for one day and stop the next. Ring another day and be fine the next. It seemed it would always start up like someone turned a switch on first thing in the morning.

My family Dr has me going to a ENT and hopefully I get in this week.

My issue is why does it seem to come and go day by day? Is this a normal tinnitus issue. Thank you.