I had been on it just over 4 weeks, which like Laurie says is long enough for your body to become dependent on it. Instead of stopping completely as a test, maybe reduce the dosage a little. Definitely worth speaking to pdoc about it first though.
I didn't find it too bad, apart from it trying to kill me with the blood clots. But I can't reiterate how grim I felt coming off it cold turkey; it was like a really bad hangover after drinking Absinthe.
Hope you get a good resolution to it