I am not aware of alcohol affecting the PSA level. Other than prostate cancer, there are several other diseases that can raise the level - including infection of the prostate, prostate trauma (i.e. after a digital rectal exam or prostatic massage), or inflammation/enlargement of the prostate.
If elevated, the biopsy is a reasonable next step - as you are doing.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b