Am I entering menopause?

I am 47 and my cycle last month was 39 days in between and then this month was 23 days in between. I have always been on schedule. I have also gained another 8 lbs. and I feel miserable. I am presently taking a multi-vitamin, garlic, glucosamine, and omega-3. Am I entering menopause? I've had the hot flashes and night sweats for a year or so.