about 10 years ... never paid attention that I was not bruising or anything. Blame primary care Dr. for not catching it I go for bloodwork every 90 days I take 14 medications daily you would think they might want to look once in a while. I'm diabetic and have learned after a while Dr's tend to turn a "blind ear" to your complaints ..everything is blamed on your diabetes .. the flat you have on the way to the Dr's office to the rain outside .. lol ... Do ask your neuro about it mine said he seldom see patients like me that are doing all the right thing and have a medication fail them ..