One of the common side effects of antidepressants, more common in
young people but also in
adults, are violent and suicidal thoughts. Sometimes a particular antidepressant can be very stimulating as well for some people, and Prozac is one known for that. That can increase your anxiety rather than help tamp it down. Much of this typically happens during the early phase of taking the drug and can stop over time, but it can also just be that this is not the proper medication for you.