So I got more folks saying they also would like answers than answers. I summarize below but I found a lot of good information at this site: lowcarbdiets.about.com/od/whattoeat/a/flaxinfo_2.htm



It stated if the flax starts to taste bitter, throw it out. And that ground flax should be used, even if in the fridge, within a few weeks! 



Other sites on the web (I searched ground flax seed storage) seem to indicate that it will go bad in one to two weeks if not refrigerated and from a few weeks to a few months when in the fridge.  Whole seeds will last up to a year in the freezer. 



Folks who responded indicated two main things: 

(1) they store the ground flax in the freezer not fridge and commented it should be good that way for several months to a year

(2) They buy whole seeds and grind as needed as seeds are good for very long time



One person said she got gluten like reaction to flax and threw it out. She said she thought this was common.



Also, I hadn't realized that you need to be very careful to drink lots of water when adding flax to your diet and to do so gradually --- this could be where folks got a gluten like reaction! Potent stuff those flax seeds! 

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