Help?!?😖

So I'm on the pill and have been for a few months now, but a couple of months back I started getting serious abdominal pains to the left and centre and low down, I went to the doctors numerous times but they won't do anything, I have had 2 periods in each month for 2 months now and the second lot of bleeding is always a lot dark and has more lumps in it, now this week I'm getting pains on the right side closer to my hip and been feeing sick and heaving but never actually being sick, any one got any ideas or just advice????