I think I have a yucky stomach virus which I read up on and says it can cause extreme exhaustion. With that being said for the past two days which has been when I started getting this stomach virus I have been taking Nuvigil and has no effect at all on wakefullness can this be due to the exhaustion I have with this stomach bug. I am just afraid that this drug which has been perfect for me is no longer working so I am hoping its just that the nuvigil isn't working because of extreme exhaustion with this flu. Any advice would be appreciated. Thank you all in advance.