Dark Tower Series? Spoiler if you haven't read series?

just finished book sever and wow am I pissed....so he finally gets there and no action? Come on I read for seven books and there wasn't even any action on the tower? Then he gets to top and loses his memory and starts over again? does he go back in time or just start over? Susannah just leaves? how gay. Way to write out jake and eddie...so disappointed. Overall I loved books 1-5, then king added himself, mordred happen and that was a disappointment. the bumbler bit him then he got shot...really that's it? Are there any other books relating to the dark tower series? graphic novels or anything? Will king ever write another book relating to this? maybe roland in his younger years?