I too have a problem with blood clots and I had to have three stents put in. They are in the Superior Vena Cava area. I am on coumindin for life also.
my doctor is really good about going over the food and things that will affect the coumindin and we have finally achieved a theraputic dose. But I have to get my INR checked every week if it is off any otherwise it is checked once a month. I can usually tell when it is off. Also, they tried giving me the generic Warfarin and we could not get a theraputic level, so I have to stay on the name brand. Best wishes to you!