go get some pb blaster it's good at eating rust. soak it where the sway bar meets the endlink, and where the edlink bolts to the lca'. then try to get the nut off if not, go get a dremel cut the endlink in half. remove your sway bar, and put it on a vice and use vicgrips to force the nut off. if that doesn't work. there should be enough room between the nut and the sway bar (they way you describe it) cuse the bolt off of the endlink and get it out of the sway bar..

after that all you got left is the edlink on the lca.same deal, if it doesn't give. you may have to drill the bolt out of the lca, using a tap and dye set. what that does is you drill into the bolt and put this piece which is reverse threaded and when you put in the screw you drilled through turn counter clock wise and it'll expand around the bolt, and hopefully pull it out of the lca.