Hmmm, well usually it takes a few days of taking it before you notice an improvement in the pain. How long are you taking it for? And what is the dosage? I was on it for 6 days. The first day I had to take 6 pills, then 5 the next day, then 4, and so on. Driving really aggrivates my pain as well. I know it felt good to be pain free, but you probably over did it those first two days. I would rest and keep taking the meRAB.