For the last year i've been getting my period every 4 months. this cycle i'm changing my tampon & pad every 45 minutes. should i be worried. i'm 43!

Yes, see a doctor: Bleeding heavily enough to have to change a pad and tampon every 45 minutes is cause for concern because of the risk of significant blood loss. Periods every 4 months can be due to the approach of menopause but it can also be due to other causes of annovulation that are still associated with significant levels of estrogen and can lead to precancerous or even cancerous changes. You need to be seen

.period: You maybe peri-menopausal just that your period may alter over the next year or so A heavy period at this time is probably nothing to worry about it If it persists next period or does not stop I would see my physician

Evaluation: You are probably not ovulating, which is allowing the lining to thicken up significantly enough to cause heavy and/or prolonged bleeding. If you're using a larger pad and tampon then your blood loss is significant. You may need to have some hormone therapy or if you're done with childbearing an ablation.