Before ds (who is 15mo) my periods were extremely light and probably lasted about 3 days. No cramps or any physical symptoms at all.
Periods returned about 5 months after having ds and were relatively ok (just a little heavier than they used to be; no cramps or anythings) until I stopped bf at 11mo. Since then my periods have been agonising and last about 5 days. Stomach cramps so bad they make me double over, feeling incredibly sick and the bleeding is so heavy that on more than one occasion I have been somewhat caught out ( damn you sleep ) & has necessitated throwing away clothes and sheets 
Do periods tend to change that much after having children? I am unsure as to whether or not it would be a waste of time seeing a GP as it's probably just something I need to suck up (along with the max strength painkillers) and get on with. Alternatively if anyone has any good painkilling recommendations (although nothing along the lines of "have another dc!") then please let me know! 