Do antidepressants help stop the effects of my premenstrual syndrome?

YES!!! Yes anti depressants that effect serotonin have been found to be helpful with pms symptoms. Prozac (fluoxetine) for instance has indications for this. Other activities like good sleep wake hygiene, low caffeine and sodium, good exercise regimen. These can also help with pms. May also consider hormone therapy.
Yes. They do. Talk with u pcp about it and can prescribe it and tell u how to take it. Good luck.
Yes, they can. Certain antidepressants [that build up serotonin] can help your pms. You need to try them for at least 2 periods before you decide it doesn't work for you. Good luck.