PLEASE don't be too quick to let your Dr. give you a 'feel-good' pill, pat you on your head and send you on your way. Fast forward a few months and you'll find yourself with nasty side effects plus an addiction no anti-depressants.
My OB/Gyn whom I had trusted for years was going to perscribe Prozac for me when I called-in with severe PMS symptoms - and he hadn't even seen me in a year! I was not depressed, I just needed some extra hormones. I was so disappointed in him I found a new doctor.
Here is what has worked for me for severe PMS over the years (and i've tried LOTS of things) - increase your leafy green vegetables and whole grains for 2 weeks BEFORE your period is to start. I was skeptical on this working, and then very pleasantly surprised when it did work.
If you're interested, I see an Ostepathic Physician who specializes in bio-identical hormone replacement and she is awesome, let me know if you want her info (she's in the burbs). She sees lots of women for severe PMS, not just menopause.
best of luck to you, it's not in your head, hang in there.
W