I had the same two week problem in February, it eventually settled down.
My periods have been very very heavy since DS was born 4 years ago, I thought it was as a result of the aspirin I am on for my heart, but seemingly not.
TMI alert I was filling a super tampax in an hour or less sometimes.
I have seen a Gynae, who recommended ?.. guess what??? the Mirena coil, they are handing them out like snuff at a wake at the moment . I refused her kind offer , she had mentioned two other possibilities, which also didn?t appeal.
Tranxamic something or other acid, basically tablets or cauterisation of the lining of the womb(lovely)
So??? there was a tumbleweed moment after I turned down all her suggestions and then and only then did she mention the fact that I could have Microval in tablet form, which is the contraceptive in the mirena coil, and no need for a foreign body to be inserted into my nether regions. I am only on for about 15 days, so I am not in a position to say whether it has worked or not.
HTH
I am 41 BTW