Menopause or premenause?

I am forty-six years old. I know I am in the beginning of menopause. For years my periods have always been on time everymonth. Now they come every three or two weeks apart. One month i bleed very heavy last for 6 days. Next month not so heavy last 6 days. This month not really bleeding looked like old dried blood. went 6 days. I have very bad mood swings a day or so before the unset. I have terrible night sweats. Can someone give me some information on what else my body will be going though . Also my drive is straight down the tube. Will i get that back. I do not have to worry about being pregnant when and if i skipp periods my husband and myself have been fixed. Thank you for any help and information.