The side effects of Prozac (generic name: fluocetin) might include decreased libido, but no medical studies exist that it can also affect the level of testosterone in the blood.
Assuming that the laboratory results indicated the level of free testosterone in the blood (normal range in male: 175-700 pmol/L), you might be experiencing some symptoms related to increased testosterone, for example increased aggressiveness. Long period effect of high testosterone might be manifested by affecting the prostate.
You might consult with your doctor if the dosage of Androgel needs adjustment or even might be completely stopped.