My period is on day 11, should I see a doctor?

I am 40 years old and I rarely have a period. However, I started my period 11 days ago and I am still experiencing heavy bleeding, without any sign of diminishing. I would have sworn that I was in early menopause because of my lack of period, hot flashes, and severe night sweats. When should I seek medical istance? I am exhasuted and still ping blood clots.