Does Early Periods, Fatigue And Mood Swing Indicate Perimenopause Symptoms?

I am 48 and experiencing alot of changes... I have noticed changes in my menstral cycle the past 2 years. They are 5 days earlier each month. Heavy with clottting. stronger cramps, frequent extreme fatigue, mood swings, feeling warmer than normal, I started my period april 26 and haven't stopped other than a day here and there. ( 41 days now) Is this possibly perimenopause or something more serious? I'm scheduling an appt. tommorow with GYN. What are the steps usually taken to get this under control again?