Worried

Stephanie
So I got my periods again I only had then 2 weeks ago but my body is getting use to not having the depo needle anymore 
And my periods are abnormally heavy lots and lots of clots I'm having to change pads nearly every half hour.... I'm suffer from cramps really badly that I can hardly walk (I'm still going to work) and I'm not sleeping at night now 
I'm taken panaden forte as well as ponstan for the pain I'm using heat packs and drinking hot drinks but nothing seams to be helping 
Is this just normal? 
I use to suffer from them really badly when I first got them but mum put me on the pill to help with the pain and flow of it so I haven't actually had a period with out any contraception in my system 
I'm thinking I should go the doctors about it? It's effecting my sleeping and my working now