Hello Firenze,
i am sorry for you and other p.f .members who have, and are suffering, how ever im sure you would have seen your doctor but simply as a suggestion have you had a chat with your local chemist or pharmacist,
over time iv found the pharmacist more knowledgeable than the doctor, and perhaps he or she might have alternative suggestions to make, in the past when i wanted advice iv found their advice better than the doctor,
what ever you do, i hope you get help, and soon, best wishes, alfred,.