Really heavy menstruation and big clots

Last May I got a really long period with huge clots. It lasted about a month long. I didn't get another one until October, and it lasted on and off light and heavy until February of this year. My obgyn gave me a strong birth control that helped. If I missed a pill or two I would get a period but it was always light and short. About a week ago, I missed a pill and took it along with my next scheduled pill. I got my period. But now it's really heavy and I'm having really really big blood clots. I've been taking my birth control still, but it's not stopping. It's just gotten even heavier. Actually, it not the flow really, it's the blood clots, they're just slipping past my tampon, and so I'm having to go to the bathroom every 45 minutes to an hour to change. I've called my obgyn and he said to keep taking the pills. I called him again this morning and left a message because it's just getting rediculous! It's a good thing I don't work or I'd have lost my job by now. Has anyone had this problem? If so, what have you done that's stopped the bleeding? I have my surgery scheduled for August 5th, and I'm worried that something going to come up and I'm not going to be able to have it. On top of it all, I'm supposed to stop taking the birth control in July because of the surgery. Help! -Lorraine

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