There is no narcotics in it but after taking 800mg i feel kinda "high"

My 2nd dose in the afternoon of 800mg seems stronger as i guess the mornings dose is still slightly affecting me.

How does this medicine work.Does it numb nerves in the brain / feet or something different?

Can doing 1600mg's - 2400mg's per day wreck havoc on my body,brain,organs?

Thx for any insight.It helps with my foot pain although it does not take 100% of the pain away doing 800mg's twicw per day.Thinking of calling my Dr and asking him to increase to 3 times per day.