What Causes Fatigue While On Modafinil?

I am experiencing incredible fatigue, along with itchy palms and the soles of my feet. I completed an extensive sleep study that concluded I do not have sleep apnea, nor do I have narcolepsy. I do have sleep paralysis and excessive daytime sleepiness. I ve been prescribed modafinil 200 mg once daily. I ve been taking it for over 5 months now. It is not working. I fall asleep sitting up at my desk. I fall asleep driving down the highway. The itching began over the last month or two. An added detail about the sleep paralysis - I was told it is very brief for most people, so brief most aren t even aware they ve experienced it. That is not the case in my situation. My eyelids are the worst. They simply will not open for at least one minute, but usually even longer. When they do, it is only a partial opening, or one eye will start to open and the other won t. It always takes approximately 5 minutes for them to function as normal. The other issue I have is waking up choking and unable to swallow or take a breath. It s incredibly frightening. I was prescribed Prozac for sleep paralysis but all it has done it give me some tics. The worst one is gritting/grinding my teeth so hard that my teeth have actually spread and worn down. I discontinued the Prozac on my own 3 months ago, however, the gritting/grinding of teeth continues as if I m still taking it.