This thread may be a bit slow as a lot of folks are out doing their festive thing but have no fear you will get some great responses.
I'm no Doctor and I'm not sure that is what you need anyway. The 600 mg twice a day is a lot but being only 20 (and I don't mean that in any derogatory way)I guess your body can take it. However watch out for nose bleeds. But man at your age you need some real good advice and in what I'm reading I don't think your getting it.
I would try and get to a specialist in Neurology (I think). Your to young to get the wrong treatment. Good luck and hopefully some of our great Catters will be on soon to help you out.
Beer (adrien)