Hi, I am going on 41 yrs old. I have been having very irregular periods for the past 4 months. Usually i am on a 28 day cycle. I am now seeing it go as soon as 21 days and heavy, with lots of blood clots. This is totally unusual for me. I am not sure if i am in premenopause or not. I have been moody lately and get up a few times at night because i am hot. But it is summer so i am assuming that is why.