Scary blood pressure issues

Im almost positive im in perimenopause. Something really scary happened to me last week. I was at a festival with my son and got really dizzy and everything went black. I also experienced incontinence. They called paramedics and my blood pressure was 58/36. They immediately rushed me to ER where everything came back normal. They diagnosed it as dehydration but my kidney function was normal. Im so sick of fatigue and I've gained 8-10 pounds and its all in my midsection. I currently 7 days late for my period but have all the pms symptoms. I have a PCP appointment on April 23rd but im really concerned.