I started taking Prozac 17 days ago for anxiety and depression--the depression being the worse. My pdoc had originally given me Zoloft, but because I came down with gastritis (unrelated to the Zoloft) she decided to switch me because she says Zoloft can affect the stomach. As a side note, my second day on Zoloft was quite good. While I still felt low and anxious (and had the physical depression symptoms that plague me like headaches, stomach aches, and random body aches), my brain fog was gone! It felt like a miracle. This one improvement gave me faith that the drug would work--and quite frankly, brain fog is one of the most miserable depression symptoms to me. But, I had to switch to Prozac after only 5 days on Zoloft. Immediately on Prozac, I had the energy to get things done--like clean my apartment, cook, do my schoolwork, etc. Even though I felt very down, Prozac gave me the energy to get up and do at least some things. Again, this gave me faith that Prozac would be a good medication for me. All of the first week--and I only started on 5mgs so it could I have been a placebo effect--I felt ok. "OK" was acceptable as I know these meds don't work overnight. But, starting week 2 gastrointestinal side effects, insomnia, and other side effects began to kick in. On day 14, I had to increase my dose to 10 mgs...and I have been taking .25-.5 mgs of Xanax for the last 4 days to help with my increased anxiety and insomnia. I also take Tylenol as needed for the headaches. Can anyone weigh in about their experiences on Prozac? Side effects? How long it took to work? Whatever you want to share, I want to hear. I want to stick it out at least a month on the Prozac, but now that my gastritis is gone I am considering asking to be switched back to Zoloft--only because I have read that Prozac can increase anxiety even after the initial side effect period has passed.