The first day of my last period was the 4th may, after not having one for 2 months, then yesterday I started to bleed again then this morning it came back with a vengeance, I felt very fuzzy headed and weak, blood flow has started to slow a little bit now, I'm 56 and the last blood tests I had about 5 months ago to see if I was menopausal the results came back saying I wasn't starting the menopause, are these tests very accurate?