I found this Silverweed (Potentilla Anserina ) in Vilnius. With its antispasmodic effects and it's tannins, it's one of the best natural drugs for women who suffer a painful and too strong menstruation. It's also used for little wounds of skin and mucosa.
Disclaimer: Never use plants, you don't know! If you are unsure about your health, you should see a doctor!