Hey Sue,
I was also started out on Enbrel and then moved onto Humira. If the Enbrel was 35% effective then Humira is about 45%. Not much difference for me. I am completely unaware of any side-effects and your post has me wondering...maybe I should dig out those info sheets because I don't remember any warnings? Gulp.
I do tend to get some wicked headaches when I've missed my shot though? Not sure if that is related or not yet.