I also take this but I was put on it more for nerve pain associated with complications from a back injury that I have also.

I am taking 600mg at bedtime and 300mg..morning and afternoon...I was taking 600mg, three times a day but felt it was too much. I am not sure if it is helping or not but considering all the things I am dealing with in my life at present and I am not falling apart totally...maybe this is it.
Take care. I have had no appetite and a lot of nausea too but I thought that was the pain meds.