I have lupus anticoagulant syndrome,I am on coumadin,inrs are inconsistant,should i be on any other meds to prevent clotting? can I develop clots even though I am on coumadin?I have many symtoms and history of blood clots in the ivc,femoral vein and lungs,I have been having pains in my neck that feel like it's in the vein,do I need to be concerned?