Lisa, def Imuran can cause nausea. for me it caused also vommiting untill I couldn't bear it.
and it is totally ok for you to share your pains. headaches are so aweful because after all we mostly need our head to get around.... but I am also thinking about your poem from another thread, that about being, and sometimes when we "use" our head too much, think too much, holding oursleves "inside" out heads, and this sure can make headache or make the headache worse. I hope you will soon feel better. sending my hugs and prayers.