Does anyone take evening primrose oil?

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I've been suffering quite badly from pms recently....mood swings (poor husband lol) as well as really bad carb cravings, to the point I went to see my Dr. He has suggested taking evening primrose oil so I bought some today and felt really tired afterwards. Just wondering what time of day I should take it for best results and if it has been helpful to anyone else for carb cravings and moodswings.