Getting pains in my lower stomach, been on contraceptive pill for a few months?

I was put on the pill a few months ago now for heavy and extremely heavy periods, but towards the end of the cycle of pills, I get these aches and pains in my lower stomach. I've also been feeling a bit faint and strange on occasion, especially after eating a lot of food. I asked my doctor about the pains and he said that was normal, but I'm worried about the light-headedness. Should I ask whether I continue the pills or not? They have at least helped with the pain and the heavy periods.