I currently am taking 1500 mg if evening primrose oil daily. can, and should, i be taking an omega 3 supplement as well. ?

Depends on your diet: This depends entirely on how many omega 3 fats you ingest in your diet. If you eat lots of fish like wild salmon or sardines, flax or hemp seeds and walnuts then you should get adequate omega 3's. If you do not eat omega 3-rich foods regularly then I advise a good-quality fish or krill oil, ideally one that has been purified. See http://www.hsph.harvard.edu/nutritionsource/omega-3-fats/