Period pain after birth?

I get bad periods still 9 months after giving birth constant shooting pain from my lower back down to leg and my toes painful constant pelvic cramps and crazy cravings this lasts 3-4days sometimes even for a week prior to getting them as well, and terrible mood swings. I eat bananas everyday... But they are soo much worse even before I fell pregnant they weren't this bad. Pain relief (ibuprofen/codeine) doesn't touch it or just takes the edge off so I can sleep at night but I don't like taking pain relief during the day because i need to be able to function for my 9 month old and my partner works long days and heat packs are a very short lived relief too. Ugh does anyone have any suggestion????