Hello
Thanks for posting your query at DoctorSpring.com

You are right, these changes are mostly due to menopause or peri menopause.
However, you should have an evaluation since you are having very heavy periods, and this can lead to weakness, blood loss and anemia.
Please consult a Specialist Gynecologist and go for the following workup suggested -
Internal evaluation
pap Smear
Pelvic transvaginal ultrasound scan.
Hormonal levels - FSH, LH, TSH, Prolactin.
This will tell you whether menopause is close by.
The condition that is most common during this phase is called endometrial hyperplasia, thickening of the lining of the uterus due to hormonal imbalance.
This can be treated with cyclical progesterone therapy.
Please get the evaluation done at the earliest.
All the best.
Please feel free to discuss further.