Had hysteroscopy, fibroid + polyp removed dec 7. week later massive clots and heavy bleeding with labor like pains for a week (timing was aligned with period). month later this cycle, have the same massive clots and heavy bleeding, worse than pre-op?

Schedule a follow up with your gyn surgeon. They can go through your surgical case, the findings and the pathology report. They can also suggest the possible next steps given your unique case

Agree with Dr. L with the need to see your doctor. Take oral iron and multivitamin supplements to prevent anemia, pending the resolution of the underlying issue.