im a 48 year old female, 5ft 150lbs, just had bilateral mastectomy for BC, got a small embolism in my lung after surgery, they have put me on fragmin (heprin) for 3 months (injection), 3 questions will this be forever?, what are the chances of an embolism happening again? and can i safely take a multivitamin daily?, thanks for your time, Bev