my first thought was that you need b12 shots. if you need them, you REALLY need them and will feel better. if you dont feel any better then it wont hurt you anyway. if you do feel better then take a shot every day for a few days past when you dont feel them doing anything.
i found this method as a cure for something, i forget what, but it just clicked with me as a great way to cure vitamin B12 deficiency. that can be as bad as low thyroid.
only shots will do. you cant screw around with anything else and know if its working or not.