What Causes Irregularities In Periods?

I started my periods at 15-16 years and they have been irregular. At around 31 years, I went to the gynac and she told me everything was fine and treated me with some iron capsules. I started getting my periods regularly. Since I was 34 years, I have been experiencing a little fuzzyness but this lasted only for a couple of days and still reoccurs. The periods were however regular. Last year, I missed a period and was diagnozed with mild PCOS. I was treated and the periods were regularized. I started a Herbal treatment for PCOS and I am currently on it for the 3rd and last month. For the first two months, I experienced some pms symptoms like cramps and bloating but my periods came perfectly. This time, I have had cramps accompanied by some tingling / numb feeling in my hands, feet and abdomen. I even have the feeling that my menstruals will come but they haven't as yet. I am still getting the tingling and cramps. I know I am not pregnant. What could be the cause of this. Could I have reached menopause ? It is really stressing me out.