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First of all, subdurals are rarely fatal except when they are very large. The bleeding would have stopped now, even if your INR was very high.
If the headaches persist, it would be worthwhile to ask your physician if they can do a head CT in a week or so to see if you had a small subdural. Most of the time, with a small subdural we would only watch and your body would gradually reabsorb the blood - much like any other bruise.
The bigger concern would be that if you were to have ongoing headaches, problems with your balance, confusion and you were to keep falling (and perhaps not remember it), that larger subdurals could accumulate.
Here is a good article on subdural hematomas - http://www.nlm.nih.gov/medlineplus/ency/article/000713.htm
At this point, I am not worried that you have a large acute subdural, and I do not think you are going to die - so don't let me make things worse by giving you something more to worry about. The reason I'm sending the link is that what Dr. Saha was talking further out is the chronic subdurals. This article has a nice list of symptoms that you can watch for.
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