Ok I need help. Let's start...

Last months period was over a week late (almost 2) finally when my period came I was in EXTREME pain for hours (went to the hospital where they made me make sure I didn't have any female issues or was pregnant) then period only lasted two days and was VERY lite. I usually flow really heavy and last 5 days. I usually go through 36 Super tampons...and this time maybe 4 tampons total.

This month. I had a laproscopy (spelling?) done to make sure I didn't have endometrosis, I don't, but period late again and instead of period blood signifying my period it was dark discharge- almost black. I am still having horrible cramps, I hardly have any bleeding and its dark. Any idea what is going on? I really don't want to call my doctor AGAIN. ..

...so weird for me. For 11 years I have had short periods- 21-23 day cycle and last 4-5 days and VERY heavy. I am not sure what is going on. Any help would...help :-)