TTC, Trombofilia Factor V.Leden, PCOS, and polyps

I had polyp taken out in April 2007 and 6 months later I have grown another, which is about 2cm big now and has been growing steadily. The uterine lining also appears always too thick. I have to have the polyp removed again. Another problem is that after the d&c in April I had another blood clot in my right leg which was probably due to the low dose of Fragmin I was on. It was my 5th blood clot in my legs sofar. My doctor wants to try Clomid to help me to conceive. I would like to know why these polyps keep growing so quickly, and what can I do to reduce the symptoms of PCOS and increase my chances of conceiving. My periods are irregular. Also due to my blood clotting disorder what will be my other options in ttc if the clomid won't work. I was told IVF would be too risky due to the amount of hormones that are to be taken. The medications I am now taking is 50mmg Levothyroxin, Warfarin 8mg, and will be on 50mg Clomid again, last time I was on Clomid was in January 2007 and I failed to ovulate, also I didn't have my period after that. Thank you.