Help! Lower abdominal cramping 7 days

Hi everyone! So I stopped taking my birth control oct 12,2017. I started having a “period”? Withdrawal bleed? The next day and then had a period November 19-25. My period should be coming any day now but I have had lower abdominal cramping since Wednesday, so this is day number seven. They started as mild off and on then became moderate off and on. Saturday I had two instances of severe pain. The first one lasted about eight minutes then the pain stopped and I fell asleep. I was then woken up by severe pain for about ten minutes with an inability to get in a comfortable position, nausea, dizziness, and was sweaty. I almost went to the er but When the pain went away I felt fine. So I said to myself if the pain gets severe like that one more time I will go, but it has not come back like that. Only moderate pain. I took a pregnancy test on Friday morning and it said it was negative. Has anyone experienced anything like this? It is affecting my normal activities. I don’t have any trouble urinating, I am passing gas, and I don’t have sore or tender breasts but I am tired a lot this past week.