I've been studying the last three weeks for my board licensing exam. I was scheduled to take it tomorrow, but I cancelled. The last week or so I've been feeling exhausted. Sleep or taking Sunday off have brought no restoration to normal. During the three weeks, I've been taking vyvanse, an ADD med similar to adderrall. I've also been building a tolerance to it. My sleep has been shallow and I wake up at the same time (7am) every morning no matter how late I go to bed. My head feels foggy and "full." It's like I can feel my brain. I have a little hard time keeping my head up. anyway, prayer and advice would be great. Thanks in advance.