What Causes Severe Menstrual Bleeding After IUD Removal?

Hi, may I answer your health queries right now ? Please type your query here...im 41 years old, I have had normal peroids my whole life. I had a IUD inserted 3 years ago. I had it removed 2 months ago due to cyst and infections. My first peroid after removal was normal, but this peroid had lasted 3 weeks with clots. I have seen a obgyn,she suggested I was permenopausal. She sent me home with Prometrium. Iam a smoker and Im very concerened about blood clots with this medication, but Im scared not to take it because Ive been bleeding since Oct.4th. Whats going on with me?