What Causes Light, Early Periods With Sore Nipples And Breasts?

Hello I am 37 years old , I am 5 ft 4. And a size 12 UK ( dint know my weight) .
I have a 21 month old daughter. I suffered extreme PMT on in the 10 th October then startedperiod on the 12 th. I had sore breasts( never had before) nausea and painful cramps . My breasts remained sore and then broke out in spots two weeks later. Also feeling extremely wiped out everyday by early afternoon. Took preg test and was negative . Another period arrived 22 days since my last period ( cycle 23/ 24 days ) . Started light and then heavy clotting and nearly fainting with NO cramps at all this month . Very frustrated because I don't appear to be pregnant . What could be the problem ? I had breast examination and everything is fine (2 days ago ). Don't understand exhaustion and ongoing sore nipples / breasts. Need some answers lol