Hello, I have gone through your query and understood the concern. I would like to know why your doctor suggested Tamoxifen and steroid. Your symptoms suggest that you are experiencing metropathic cycle. The clot could be a discharge of endometrium as a whole. You need further evaluation which includes coagulation profile, blood counts, hormone profile, urinalysis and sonogram of the pelvis preferably in the trans-vaginal route. Maintenance of a normal BMI and regular exercise is also important. Supplementary therapy is also needed to aid in the treatment. Styptics are needed to control the bleeding; hormone courses may be necessary to check the bleeding and set the cycles on track. Metformin is of help if insulin resistance is detected. Hope your query has been answered. Take care.