I know that when I took fluoxetine no matter how much they upped my dose or how long I took it, it never helped me. It might just be the wrong drug for you or you haven't taken it long enough to feel it or you need a higher dose :)

Will either definitely need to speak to your doctor about it or find a new doctor for a second opinion. I had undiagnosed ADHD while having depression and anxiety and anti-depressants itself worked a little but kept wearing off, even at the highest dose. Being on both ADHD and antidepressants has helped a lot, so seeing the doctor again to either change meds or see a new one for a second opinion would probably help.