Suggest Treatment For Muscle Pain And Fatigue After Pulmonary Embolism

I am a 48 year old female and I had an extensive bilateral Pulmonary Embolism March 27, 2011. During the investigations, they discovered that I have a nodule in my upper right lung, a cyst on my spleen and an enlarged liver and spleen. I have been suffering from symptoms of extreme muscle/tendon pain, particularly in the morning when I get out of bed (can barely walk), fatigue and pale, beige coloured stool (for the past month). I have pain in my right arm, left hand (middle finger), ribs (back and sides), entire back, neck, hips, legs and achilles tendons/heels. I am scheduled for another CT scan with contrast in about 2 weeks and a mammogram and am on Warfarin 6 mg/day. They cannot seem to keep me at a therapeutic level on the Warfarin. I am at 6 mg (increased lately) and was up to 2.1, then dropped to 1.8 (my diet has been steady). Could you please give me some idea as to what is going on as I feel very frustrated with my symptoms and the lack of answers. Thanks so much.