Evening Primrose Oil

So I have been taking Evening Primrose Oil this cycle in hopes of improving my cervical mucous.  I'm not sure if I really need it, but I figure it wouldn't hurt, right?  Well 2 weeks ago I began it and just took one 1000mg pill at night.  A few nights later I read on the bottle I should be taking 2-3 a day, so I started taking 2 at night, together.  Well I began getting nauseous and feeling sick.  This continued 3 days until I said "Hmmmmm what brought all of this on??"  I then realized that I had started taking the EPO together.  I reread the label and it says 2-3 throughout the day.  I should listen!  I stopped the EPO and felt better the next day! I have now put 1 pill back in when I take vitamins in the morning and I have been having no problems.  Too nervous to take more throughout the day though!  Now I know to pay more attention to the labels!!!