Mastalgia (pain in breast) are of two types. Cyclical and noncyclical. cyclical mastagia starts one or two days prior to menstruation
and relieves after onset of menstruation.and usually present in both the breast. where as noncyclical presents in one breast,sharp and not related to menstruation. hence i would like to consider your pain as noncyclical. it needs couselling (i.e need not worry). nonsteroidal antiinflammatory drugs are sufficient. inspite of this still you have pain it is better to consult breast surgeon. hope this answer is helpful to you.