I have been on prozac for about two months and at first I felt great but since my psychiatrist upped my dosage to 20mg instead of ten I am having trouble sleeping and get an average of four hours of sleep and then toss and turn for hours. I also wake up with headaches. Has anyone else experienced these symptoms? My doctor said that I can either switch medications or try to see if my body will get used to this and it will go away. Any advice would be appreciated.