I take 3200mg of gabapentin daily (800mg x 4). if i forgot whether i took my dose & accidentally took 2 at one point, would that be a problem?

Sedation: Most likely you would be feel quite sedated, maybe dizzy as well. It could make it hard to function. Why not use a medication box in which you can set your meds up for the week-- this way you will know if you have taken your dose or not-- just take a look in the box. Spending 1 day a week filling in the box makes the rest of the week so much easier--you will thank me!