Lying - and repenting sins as a Christian ? ?

Hun, if it is a disorder, there is not much you can do. You can do everything you can to try to reverse it or control it, but then again, I do not have it so I do not know how it feels. I am, however bipolar, and it is very difficult to manage, but I do my best to. All in all, good sleep, eating right and exercise help everything. Perhaps you could practice speaking more slowly, or stopping to think every time you go to speak. Then run what you're about to say through your head. It may take a while, but soon it'll be much easier to do. Just keep trying. And if there is god, a creator, etc. he/she would know how your mind works. They would understand. You just try to be the best person you can be, and do the next right thing as much as possible. It isn't as though you're hurting someone, but lying is not alright. You can better yourself through hard practice. God/the creator/ the divine knows what kind of person you are, and your character is what matters.