Upset over something i just read about restless leg syndrome linked to impotence?

ok so i just read this new article which says that restless leg syndrome has now been linked with male impotence, making men who have restless leg syndrome 50% more likely to be impotent and have erectile dysfunction. my boyfriend often shakes his legs when we are going to sleep at night, so i think he might have restless leg syndrome (though he's never been diagnosed or anything) and now i am all worked up and scared at the idea of him being impotent, i am 20 and he is 25, it's not like we're planning on having kids any time soon but i want to have children with him more than anything some day and i am so upset at the idea of not being able to have his children. i know its stupid for me to be this upset, i don't know why i'm so emotional, i don't even know if he officially has restless leg syndrome, all i know is i'm upset! how do i calm down? can someone try to put my mind at ease somehow?